Updated on 2026-08-14

tangem-core/src/main/java/com/tangem/TangemSdkError.kt

@@ -105,7 +105,7 @@ sealed class TangemSdkError(val code: Int) : Exception(code.toString()) {
     class TooManyHashesInOneTransaction : TangemSdkError(40906)
 
     //Write Extra Issuer Data Errors
-    class ExendedDataSizeTooLarge : TangemSdkError(41101)
+    class ExtendedDataSizeTooLarge : TangemSdkError(41101)
 
     //General Errors
     class NotPersonalized() : TangemSdkError(40001)

tangem-core/src/main/java/com/tangem/commands/CheckWalletCommand.kt

@@ -70,19 +70,14 @@ class CheckWalletCommand(
         }
     }
 
-    override fun performPreCheck(
-            session: CardSession,
-            callback: (result: CompletionResult<CheckWalletResponse>) -> Unit
-    ): Boolean {
-        if (session.environment.card?.status == CardStatus.NotPersonalized) {
-            callback(CompletionResult.Failure(TangemSdkError.NotPersonalized()))
-            return true
+    override fun performPreCheck(card: Card): TangemSdkError? {
+        if (card.status == CardStatus.NotPersonalized) {
+            return TangemSdkError.NotPersonalized()
         }
-        if (session.environment.card?.isActivated == true) {
-            callback(CompletionResult.Failure(TangemSdkError.NotActivated()))
-            return true
+        if (card.isActivated) {
+            return TangemSdkError.NotActivated()
         }
-        return false
+        return null
     }
 
     override fun serialize(environment: SessionEnvironment): CommandApdu {

tangem-core/src/main/java/com/tangem/commands/Command.kt

@@ -41,47 +41,46 @@ abstract class Command<T : CommandResponse> : ApduSerializable<T>, CardSessionRu
 
     override fun run(session: CardSession, callback: (result: CompletionResult<T>) -> Unit) {
         Log.i("Command", "Initializing ${this::class.java.simpleName}")
-        if (session.environment.handleErrors) {
-            if (performPreCheck(session, callback)) return
-        }
-        transceive(session) { result ->
-            if (session.environment.handleErrors) {
-                if (performAfterCheck(session, result, callback)) return@transceive
-            }
-            callback(result)
-        }
+        transceive(session, callback)
     }
 
-    open fun performPreCheck(
-        session: CardSession,
-        callback: (result: CompletionResult<T>) -> Unit
-    ): Boolean {
-        return false
-    }
+    open fun performPreCheck(card: Card): TangemSdkError? = null
 
-    open fun performAfterCheck(
-        session: CardSession,
-        result: CompletionResult<T>,
-        callback: (result: CompletionResult<T>) -> Unit
-    ): Boolean {
-        return false
-    }
+    open fun performAfterCheck(card: Card?, error: TangemSdkError): TangemSdkError? = error
 
     fun transceive(session: CardSession, callback: (result: CompletionResult<T>) -> Unit) {
-        try {
-            val apdu = serialize(session.environment)
-            transceiveApdu(apdu, session) { result ->
-                when (result) {
-                    is CompletionResult.Failure -> callback(CompletionResult.Failure(result.error))
-                    is CompletionResult.Success -> {
+
+        val card = session.environment.card
+        if (session.environment.handleErrors && card != null) {
+            performPreCheck(card)?.let { error ->
+                callback(CompletionResult.Failure(error))
+                return
+            }
+        }
+
+        val apdu = serialize(session.environment)
+        transceiveApdu(apdu, session) { result ->
+            when (result) {
+                is CompletionResult.Failure -> {
+                    if (session.environment.handleErrors) {
+                        performAfterCheck(session.environment.card, result.error)?.let {
+                            callback(CompletionResult.Failure(it))
+                            return@transceiveApdu
+                        }
+                    }
+                    callback(CompletionResult.Failure(result.error))
+                }
+                is CompletionResult.Success -> {
+                    try {
                         val response = deserialize(session.environment, result.data)
                         callback(CompletionResult.Success(response))
+                    } catch (error: TangemSdkError) {
+                        callback(CompletionResult.Failure(error))
                     }
                 }
             }
-        } catch (error: TangemSdkError) {
-            callback(CompletionResult.Failure(error))
         }
+
     }
 
     private fun transceiveApdu(

tangem-core/src/main/java/com/tangem/commands/CreateWalletCommand.kt

@@ -1,9 +1,7 @@
 package com.tangem.commands
 
-import com.tangem.CardSession
 import com.tangem.SessionEnvironment
 import com.tangem.TangemSdkError
-import com.tangem.common.CompletionResult
 import com.tangem.common.apdu.CommandApdu
 import com.tangem.common.apdu.Instruction
 import com.tangem.common.apdu.ResponseApdu
@@ -12,18 +10,18 @@ import com.tangem.common.tlv.TlvDecoder
 import com.tangem.common.tlv.TlvTag
 
 class CreateWalletResponse(
-        /**
-         * CID, Unique Tangem card ID number.
-         */
-        val cardId: String,
-        /**
-         * Current status of the card [1 - Empty, 2 - Loaded, 3- Purged]
-         */
-        val status: CardStatus,
-        /**
+    /**
+     * CID, Unique Tangem card ID number.
+     */
+    val cardId: String,
+    /**
+     * Current status of the card [1 - Empty, 2 - Loaded, 3- Purged]
+     */
+    val status: CardStatus,
+    /**
 
-         */
-        val walletPublicKey: ByteArray
+     */
+    val walletPublicKey: ByteArray
 ) : CommandResponse
 
 /**
@@ -39,39 +37,25 @@ class CreateWalletResponse(
  */
 class CreateWalletCommand : Command<CreateWalletResponse>() {
 
-    override fun performPreCheck(session: CardSession, callback: (result: CompletionResult<CreateWalletResponse>) -> Unit): Boolean {
-        if (session.environment.card?.status == CardStatus.NotPersonalized) {
-            callback(CompletionResult.Failure(TangemSdkError.NotPersonalized()))
-            return true
+    override fun performPreCheck(card: Card): TangemSdkError? {
+        if (card.isActivated) {
+            return TangemSdkError.NotActivated()
         }
-        if (session.environment.card?.isActivated == true) {
-            callback(CompletionResult.Failure(TangemSdkError.NotActivated()))
-            return true
+
+        return when (card.status) {
+            CardStatus.Empty -> null
+            CardStatus.NotPersonalized -> TangemSdkError.NotPersonalized()
+            CardStatus.Loaded -> TangemSdkError.AlreadyCreated()
+            CardStatus.Purged -> TangemSdkError.CardIsPurged()
+            null -> TangemSdkError.CardError()
         }
-        if (session.environment.card?.status == CardStatus.Purged) {
-            callback(CompletionResult.Failure(TangemSdkError.CardIsPurged()))
-            return true
-        }
-        if (session.environment.card?.status == CardStatus.Loaded) {
-            callback(CompletionResult.Failure(TangemSdkError.AlreadyCreated()))
-            return true
-        }
-        return false
     }
 
-    override fun performAfterCheck(session: CardSession,
-                                   result: CompletionResult<CreateWalletResponse>,
-                                   callback: (result: CompletionResult<CreateWalletResponse>) -> Unit): Boolean {
-        when (result) {
-            is CompletionResult.Failure -> {
-                if (result.error is TangemSdkError.InvalidParams) {
-                    callback(CompletionResult.Failure(TangemSdkError.Pin2OrCvcRequired()))
-                    return true
-                }
-                return false
-            }
-            else -> return false
+    override fun performAfterCheck(card: Card?, error: TangemSdkError): TangemSdkError? {
+        if (error is TangemSdkError.InvalidParams) {
+            return TangemSdkError.Pin2OrCvcRequired()
         }
+        return null
     }
 
     override fun serialize(environment: SessionEnvironment): CommandApdu {
@@ -83,15 +67,18 @@ class CreateWalletCommand : Command<CreateWalletResponse>() {
         return CommandApdu(Instruction.CreateWallet, tlvBuilder.serialize())
     }
 
-    override fun deserialize(environment: SessionEnvironment, apdu: ResponseApdu): CreateWalletResponse {
+    override fun deserialize(
+        environment: SessionEnvironment,
+        apdu: ResponseApdu
+    ): CreateWalletResponse {
         val tlvData = apdu.getTlvData()
-                ?: throw TangemSdkError.DeserializeApduFailed()
+            ?: throw TangemSdkError.DeserializeApduFailed()
 
         val decoder = TlvDecoder(tlvData)
         return CreateWalletResponse(
-                cardId = decoder.decode(TlvTag.CardId),
-                status = decoder.decode(TlvTag.Status),
-                walletPublicKey = decoder.decode(TlvTag.WalletPublicKey)
+            cardId = decoder.decode(TlvTag.CardId),
+            status = decoder.decode(TlvTag.Status),
+            walletPublicKey = decoder.decode(TlvTag.WalletPublicKey)
         )
     }
 }

tangem-core/src/main/java/com/tangem/commands/PurgeWalletCommand.kt

@@ -1,9 +1,7 @@
 package com.tangem.commands
 
-import com.tangem.CardSession
 import com.tangem.SessionEnvironment
 import com.tangem.TangemSdkError
-import com.tangem.common.CompletionResult
 import com.tangem.common.apdu.CommandApdu
 import com.tangem.common.apdu.Instruction
 import com.tangem.common.apdu.ResponseApdu
@@ -31,37 +29,33 @@ class PurgeWalletResponse(
  */
 class PurgeWalletCommand : Command<PurgeWalletResponse>() {
 
-    override fun performPreCheck(session: CardSession, callback: (result: CompletionResult<PurgeWalletResponse>) -> Unit): Boolean {
-        if (session.environment.card?.status == CardStatus.NotPersonalized) {
-            callback(CompletionResult.Failure(TangemSdkError.NotPersonalized()))
-            return true
+    override fun performPreCheck(card: Card): TangemSdkError? {
+        if (card.status == CardStatus.NotPersonalized) {
+            return TangemSdkError.NotPersonalized()
         }
-        if (session.environment.card?.isActivated == true) {
-            callback(CompletionResult.Failure(TangemSdkError.NotActivated()))
-            return true
+        if (card.isActivated) {
+            return TangemSdkError.NotActivated()
         }
-        if (session.environment.card?.settingsMask?.contains(Settings.ProhibitPurgeWallet) == true) {
-            callback(CompletionResult.Failure(TangemSdkError.PurgeWalletProhibited()))
-            return true
+        if (card.settingsMask?.contains(Settings.ProhibitPurgeWallet) == true) {
+            return TangemSdkError.PurgeWalletProhibited()
+        }
+
+        return when (card.status) {
+            CardStatus.Loaded -> null
+            CardStatus.NotPersonalized -> TangemSdkError.NotPersonalized()
+            CardStatus.Empty, CardStatus.Purged -> TangemSdkError.CardIsEmpty()
+            null -> TangemSdkError.CardError()
         }
-        return false
     }
 
-    override fun performAfterCheck(session: CardSession,
-                                   result: CompletionResult<PurgeWalletResponse>,
-                                   callback: (result: CompletionResult<PurgeWalletResponse>) -> Unit): Boolean {
-        when (result) {
-            is CompletionResult.Failure -> {
-                if (result.error is TangemSdkError.InvalidParams) {
-                    callback(CompletionResult.Failure(TangemSdkError.Pin2OrCvcRequired()))
-                    return true
-                }
-                return false
-            }
-            else -> return false
+    override fun performAfterCheck(card: Card?, error: TangemSdkError): TangemSdkError? {
+        if (error is TangemSdkError.InvalidParams) {
+            return TangemSdkError.Pin2OrCvcRequired()
         }
+        return null
     }
 
+
     override fun serialize(environment: SessionEnvironment): CommandApdu {
         val tlvBuilder = TlvBuilder()
         tlvBuilder.append(TlvTag.Pin, environment.pin1)

tangem-core/src/main/java/com/tangem/commands/ReadCommand.kt

@@ -1,10 +1,8 @@
 package com.tangem.commands
 
-import com.tangem.CardSession
 import com.tangem.SessionEnvironment
 import com.tangem.TangemSdkError
 import com.tangem.commands.common.CardDeserializer
-import com.tangem.common.CompletionResult
 import com.tangem.common.apdu.CommandApdu
 import com.tangem.common.apdu.Instruction
 import com.tangem.common.apdu.ResponseApdu
@@ -317,6 +315,8 @@ class Card(
 
         /**
          * Whether the card requires issuer’s confirmation of activation.
+         * is "true" if the card requires activation,
+         * is 'false" if the card is activated or does not require activation
          */
         val isActivated: Boolean,
 
@@ -367,17 +367,11 @@ class Card(
  */
 class ReadCommand : Command<Card>() {
 
-    override fun performAfterCheck(session: CardSession, result: CompletionResult<Card>, callback: (result: CompletionResult<Card>) -> Unit): Boolean {
-        when (result) {
-            is CompletionResult.Failure -> {
-                if (result.error is TangemSdkError.InvalidParams) {
-                    callback(CompletionResult.Failure(TangemSdkError.Pin1Required()))
-                    return true
-                }
-                return false
-            }
-            else -> return false
+    override fun performAfterCheck(card: Card?, error: TangemSdkError): TangemSdkError? {
+        if (error is TangemSdkError.InvalidParams) {
+            return TangemSdkError.Pin1Required()
         }
+        return null
     }
 
     override fun serialize(environment: SessionEnvironment): CommandApdu {

tangem-core/src/main/java/com/tangem/commands/ReadIssuerDataCommand.kt

@@ -17,32 +17,32 @@ import com.tangem.common.tlv.TlvTag
 
 class ReadIssuerDataResponse(
 
-        /**
-         * CID, Unique Tangem card ID number.
-         */
-        val cardId: String,
+    /**
+     * CID, Unique Tangem card ID number.
+     */
+    val cardId: String,
 
-        /**
-         * Data defined by issuer.
-         */
-        val issuerData: ByteArray,
+    /**
+     * Data defined by issuer.
+     */
+    val issuerData: ByteArray,
 
-        /**
-         * Issuer’s signature of [issuerData] with Issuer Data Private Key (which is kept on card).
-         * Issuer’s signature of SHA256-hashed [cardId] concatenated with [issuerData]:
-         * SHA256([cardId] | [issuerData]).
-         * When flag [Settings.ProtectIssuerDataAgainstReplay] set in [SettingsMask] then signature of
-         * SHA256-hashed CID Issuer_Data concatenated with and [issuerDataCounter]:
-         * SHA256([cardId] | [issuerData] | [issuerDataCounter]).
-         */
-        val issuerDataSignature: ByteArray,
+    /**
+     * Issuer’s signature of [issuerData] with Issuer Data Private Key (which is kept on card).
+     * Issuer’s signature of SHA256-hashed [cardId] concatenated with [issuerData]:
+     * SHA256([cardId] | [issuerData]).
+     * When flag [Settings.ProtectIssuerDataAgainstReplay] set in [SettingsMask] then signature of
+     * SHA256-hashed CID Issuer_Data concatenated with and [issuerDataCounter]:
+     * SHA256([cardId] | [issuerData] | [issuerDataCounter]).
+     */
+    val issuerDataSignature: ByteArray,
 
-        /**
-         * An optional counter that protect issuer data against replay attack.
-         * When flag [Settings.ProtectIssuerDataAgainstReplay] set in [SettingsMask]
-         * then this value is mandatory and must increase on each execution of [WriteIssuerDataCommand].
-         */
-        val issuerDataCounter: Int?
+    /**
+     * An optional counter that protect issuer data against replay attack.
+     * When flag [Settings.ProtectIssuerDataAgainstReplay] set in [SettingsMask]
+     * then this value is mandatory and must increase on each execution of [WriteIssuerDataCommand].
+     */
+    val issuerDataCounter: Int?
 ) : CommandResponse
 
 
@@ -54,21 +54,17 @@ class ReadIssuerDataResponse(
  * @property cardId CID, Unique Tangem card ID number.
  */
 class ReadIssuerDataCommand(
-        val issuerPublicKey: ByteArray? = null,
-        verifier: IssuerDataVerifier = DefaultIssuerDataVerifier()
+    val issuerPublicKey: ByteArray? = null,
+    verifier: IssuerDataVerifier = DefaultIssuerDataVerifier()
 ) : Command<ReadIssuerDataResponse>(), IssuerDataVerifier by verifier {
 
-    override fun run(session: CardSession, callback: (result: CompletionResult<ReadIssuerDataResponse>) -> Unit) {
-        val card = session.environment.card
-        if (card == null) {
-            callback(CompletionResult.Failure(TangemSdkError.MissingPreflightRead()))
-            return
-        }
-        val publicKey = issuerPublicKey ?: card.issuerPublicKey
-        if (publicKey == null) {
-            callback(CompletionResult.Failure(TangemSdkError.MissingIssuerPubicKey()))
-            return
-        }
+    override fun run(
+        session: CardSession,
+        callback: (result: CompletionResult<ReadIssuerDataResponse>) -> Unit
+    ) {
+
+        val publicKey =  issuerPublicKey ?: session.environment.card?.issuerPublicKey
+
         super.run(session) { result ->
             when (result) {
                 is CompletionResult.Failure -> callback(result)
@@ -78,9 +74,9 @@ class ReadIssuerDataCommand(
                         return@run
                     }
                     val issuerDataToVerify = IssuerDataToVerify(
-                            card.cardId, result.data.issuerData, result.data.issuerDataCounter
+                        result.data.cardId, result.data.issuerData, result.data.issuerDataCounter
                     )
-                    if (verify(publicKey, result.data.issuerDataSignature, issuerDataToVerify)) {
+                    if (verify(publicKey!!, result.data.issuerDataSignature, issuerDataToVerify)) {
                         callback(result)
                     } else {
                         callback(CompletionResult.Failure(TangemSdkError.VerificationFailed()))
@@ -90,12 +86,12 @@ class ReadIssuerDataCommand(
         }
     }
 
-    override fun performPreCheck(session: CardSession, callback: (result: CompletionResult<ReadIssuerDataResponse>) -> Unit): Boolean {
-        if (session.environment.card?.status == CardStatus.NotPersonalized) {
-            callback(CompletionResult.Failure(TangemSdkError.NotPersonalized()))
-            return true
+    override fun performPreCheck(card: Card): TangemSdkError? {
+        if (card.status == CardStatus.NotPersonalized) {
+            return TangemSdkError.NotPersonalized()
         }
-        return false
+        issuerPublicKey ?: card.issuerPublicKey ?: return TangemSdkError.MissingIssuerPubicKey()
+        return null
     }
 
     override fun serialize(environment: SessionEnvironment): CommandApdu {
@@ -106,15 +102,18 @@ class ReadIssuerDataCommand(
         return CommandApdu(Instruction.ReadIssuerData, tlvBuilder.serialize())
     }
 
-    override fun deserialize(environment: SessionEnvironment, apdu: ResponseApdu): ReadIssuerDataResponse {
+    override fun deserialize(
+        environment: SessionEnvironment,
+        apdu: ResponseApdu
+    ): ReadIssuerDataResponse {
         val tlvData = apdu.getTlvData() ?: throw TangemSdkError.DeserializeApduFailed()
 
         val decoder = TlvDecoder(tlvData)
         return ReadIssuerDataResponse(
-                cardId = decoder.decode(TlvTag.CardId),
-                issuerData = decoder.decode(TlvTag.IssuerData),
-                issuerDataSignature = decoder.decode(TlvTag.IssuerDataSignature),
-                issuerDataCounter = decoder.decodeOptional(TlvTag.IssuerDataCounter)
+            cardId = decoder.decode(TlvTag.CardId),
+            issuerData = decoder.decode(TlvTag.IssuerData),
+            issuerDataSignature = decoder.decode(TlvTag.IssuerDataSignature),
+            issuerDataCounter = decoder.decodeOptional(TlvTag.IssuerDataCounter)
         )
     }
 }

tangem-core/src/main/java/com/tangem/commands/ReadIssuerExtraDataCommand.kt

@@ -18,37 +18,37 @@ import java.io.ByteArrayOutputStream
 
 class ReadIssuerExtraDataResponse(
 
-        /**
-         * CID, Unique Tangem card ID number.
-         */
-        val cardId: String,
+    /**
+     * CID, Unique Tangem card ID number.
+     */
+    val cardId: String,
 
-        /**
-         * Size of all Issuer_Extra_Data field.
-         */
-        val size: Int?,
+    /**
+     * Size of all Issuer_Extra_Data field.
+     */
+    val size: Int?,
 
-        /**
-         * Data defined by issuer.
-         */
-        val issuerData: ByteArray,
+    /**
+     * Data defined by issuer.
+     */
+    val issuerData: ByteArray,
 
-        /**
-         * Issuer’s signature of [issuerData] with Issuer Data Private Key (which is kept on card).
-         * Issuer’s signature of SHA256-hashed [cardId] concatenated with [issuerData]:
-         * SHA256([cardId] | [issuerData]).
-         * When flag [Settings.ProtectIssuerDataAgainstReplay] set in [SettingsMask] then signature of
-         * SHA256-hashed CID Issuer_Data concatenated with and [issuerDataCounter]:
-         * SHA256([cardId] | [issuerData] | [issuerDataCounter]).
-         */
-        val issuerDataSignature: ByteArray?,
+    /**
+     * Issuer’s signature of [issuerData] with Issuer Data Private Key (which is kept on card).
+     * Issuer’s signature of SHA256-hashed [cardId] concatenated with [issuerData]:
+     * SHA256([cardId] | [issuerData]).
+     * When flag [Settings.ProtectIssuerDataAgainstReplay] set in [SettingsMask] then signature of
+     * SHA256-hashed CID Issuer_Data concatenated with and [issuerDataCounter]:
+     * SHA256([cardId] | [issuerData] | [issuerDataCounter]).
+     */
+    val issuerDataSignature: ByteArray?,
 
-        /**
-         * An optional counter that protects issuer data against replay attack.
-         * When flag [Settings.ProtectIssuerDataAgainstReplay] set in [SettingsMask]
-         * then this value is mandatory and must increase on each execution of [WriteIssuerDataCommand].
-         */
-        val issuerDataCounter: Int?
+    /**
+     * An optional counter that protects issuer data against replay attack.
+     * When flag [Settings.ProtectIssuerDataAgainstReplay] set in [SettingsMask]
+     * then this value is mandatory and must increase on each execution of [WriteIssuerDataCommand].
+     */
+    val issuerDataCounter: Int?
 ) : CommandResponse
 
 
@@ -60,42 +60,38 @@ class ReadIssuerExtraDataResponse(
  * a series of these commands have to be executed to read the entire Issuer_Extra_Data.
  */
 class ReadIssuerExtraDataCommand(
-        private val issuerPublicKey: ByteArray? = null,
-        verifier: IssuerDataVerifier = DefaultIssuerDataVerifier()
+    private val issuerPublicKey: ByteArray? = null,
+    verifier: IssuerDataVerifier = DefaultIssuerDataVerifier()
 ) : Command<ReadIssuerExtraDataResponse>(), IssuerDataVerifier by verifier {
 
     private val issuerData = ByteArrayOutputStream()
     private var offset: Int = 0
     private var issuerDataSize: Int = 0
 
-    override fun run(session: CardSession, callback: (result: CompletionResult<ReadIssuerExtraDataResponse>) -> Unit) {
-        val card = session.environment.card
-        if (card == null) {
-            callback(CompletionResult.Failure(TangemSdkError.MissingPreflightRead()))
-            return
+    override fun performPreCheck(card: Card): TangemSdkError? {
+        if (card.status == CardStatus.NotPersonalized) {
+            return TangemSdkError.NotPersonalized()
         }
-        val publicKey = issuerPublicKey ?: card.issuerPublicKey
-        if (publicKey == null) {
-            callback(CompletionResult.Failure(TangemSdkError.MissingIssuerPubicKey()))
-            return
-        }
-        if (session.environment.card?.status == CardStatus.NotPersonalized) {
-            callback(CompletionResult.Failure(TangemSdkError.NotPersonalized()))
-            return
-        }
-
-        readIssuerData(session, card.cardId, publicKey, callback)
+        issuerPublicKey ?: card.issuerPublicKey ?: return TangemSdkError.MissingIssuerPubicKey()
+        return null
     }
 
+    override fun run(
+        session: CardSession,
+        callback: (result: CompletionResult<ReadIssuerExtraDataResponse>) -> Unit
+    ) {
+        val publicKey = issuerPublicKey ?: session.environment.card?.issuerPublicKey
+        readIssuerData(session, publicKey!!, callback)
+    }
 
     private fun readIssuerData(
-            session: CardSession,
-            cardId: String, publicKey: ByteArray,
-            callback: (result: CompletionResult<ReadIssuerExtraDataResponse>) -> Unit) {
+        session: CardSession, publicKey: ByteArray,
+        callback: (result: CompletionResult<ReadIssuerExtraDataResponse>) -> Unit
+    ) {
 
         if (issuerDataSize != 0) {
             session.viewDelegate.onDelay(
-                    issuerDataSize, offset, WriteIssuerExtraDataCommand.SINGLE_WRITE_SIZE
+                issuerDataSize, offset, WriteIssuerExtraDataCommand.SINGLE_WRITE_SIZE
             )
         }
 
@@ -112,9 +108,9 @@ class ReadIssuerExtraDataCommand(
                     issuerData.write(result.data.issuerData)
                     if (result.data.issuerDataSignature == null) {
                         offset = issuerData.size()
-                        readIssuerData(session, cardId, publicKey, callback)
+                        readIssuerData(session, publicKey, callback)
                     } else {
-                        completeTask(result.data, cardId, publicKey, callback)
+                        completeTask(result.data, publicKey, callback)
                     }
                 }
                 is CompletionResult.Failure -> {
@@ -124,21 +120,22 @@ class ReadIssuerExtraDataCommand(
         }
     }
 
-    private fun completeTask(data: ReadIssuerExtraDataResponse,
-                             cardId: String, publicKey: ByteArray,
-                             callback: (result: CompletionResult<ReadIssuerExtraDataResponse>) -> Unit) {
+    private fun completeTask(
+        data: ReadIssuerExtraDataResponse, publicKey: ByteArray,
+        callback: (result: CompletionResult<ReadIssuerExtraDataResponse>) -> Unit
+    ) {
         val dataToVerify = IssuerDataToVerify(
-                cardId,
-                issuerData.toByteArray(),
-                data.issuerDataCounter
+            data.cardId,
+            issuerData.toByteArray(),
+            data.issuerDataCounter
         )
         if (verify(publicKey, data.issuerDataSignature!!, dataToVerify)) {
             val finalResult = ReadIssuerExtraDataResponse(
-                    data.cardId,
-                    issuerDataSize,
-                    issuerData.toByteArray(),
-                    data.issuerDataSignature,
-                    data.issuerDataCounter
+                data.cardId,
+                issuerDataSize,
+                issuerData.toByteArray(),
+                data.issuerDataSignature,
+                data.issuerDataCounter
             )
             callback(CompletionResult.Success(finalResult))
         } else {
@@ -155,16 +152,19 @@ class ReadIssuerExtraDataCommand(
         return CommandApdu(Instruction.ReadIssuerData, tlvBuilder.serialize())
     }
 
-    override fun deserialize(environment: SessionEnvironment, apdu: ResponseApdu): ReadIssuerExtraDataResponse {
+    override fun deserialize(
+        environment: SessionEnvironment,
+        apdu: ResponseApdu
+    ): ReadIssuerExtraDataResponse {
         val tlvData = apdu.getTlvData() ?: throw TangemSdkError.DeserializeApduFailed()
 
         val decoder = TlvDecoder(tlvData)
         return ReadIssuerExtraDataResponse(
-                cardId = decoder.decode(TlvTag.CardId),
-                size = decoder.decodeOptional(TlvTag.Size),
-                issuerData = decoder.decodeOptional(TlvTag.IssuerData) ?: byteArrayOf(),
-                issuerDataSignature = decoder.decodeOptional(TlvTag.IssuerDataSignature),
-                issuerDataCounter = decoder.decodeOptional(TlvTag.IssuerDataCounter)
+            cardId = decoder.decode(TlvTag.CardId),
+            size = decoder.decodeOptional(TlvTag.Size),
+            issuerData = decoder.decodeOptional(TlvTag.IssuerData) ?: byteArrayOf(),
+            issuerDataSignature = decoder.decodeOptional(TlvTag.IssuerDataSignature),
+            issuerDataCounter = decoder.decodeOptional(TlvTag.IssuerDataCounter)
         )
     }
 

tangem-core/src/main/java/com/tangem/commands/ReadUserDataCommand.kt

@@ -1,9 +1,7 @@
 package com.tangem.commands
 
-import com.tangem.CardSession
 import com.tangem.SessionEnvironment
 import com.tangem.TangemSdkError
-import com.tangem.common.CompletionResult
 import com.tangem.common.apdu.CommandApdu
 import com.tangem.common.apdu.Instruction
 import com.tangem.common.apdu.ResponseApdu
@@ -51,16 +49,14 @@ class ReadUserDataResponse(
  */
 class ReadUserDataCommand : Command<ReadUserDataResponse>() {
 
-    override fun performPreCheck(session: CardSession, callback: (result: CompletionResult<ReadUserDataResponse>) -> Unit): Boolean {
-        if (session.environment.card?.status == CardStatus.NotPersonalized) {
-            callback(CompletionResult.Failure(TangemSdkError.NotPersonalized()))
-            return true
+    override fun performPreCheck(card: Card): TangemSdkError? {
+        if (card.status == CardStatus.NotPersonalized) {
+            return TangemSdkError.NotPersonalized()
         }
-        if (session.environment.card?.isActivated == true) {
-            callback(CompletionResult.Failure(TangemSdkError.NotActivated()))
-            return true
+        if (card.isActivated) {
+            return TangemSdkError.NotActivated()
         }
-        return false
+        return null
     }
 
     override fun serialize(environment: SessionEnvironment): CommandApdu {

tangem-core/src/main/java/com/tangem/commands/SignCommand.kt

@@ -1,9 +1,7 @@
 package com.tangem.commands
 
-import com.tangem.CardSession
 import com.tangem.SessionEnvironment
 import com.tangem.TangemSdkError
-import com.tangem.common.CompletionResult
 import com.tangem.common.apdu.CommandApdu
 import com.tangem.common.apdu.Instruction
 import com.tangem.common.apdu.ResponseApdu
@@ -20,10 +18,10 @@ import com.tangem.crypto.sign
  * Sums up array elements within all SIGN commands
  */
 class SignResponse(
-        val cardId: String,
-        val signature: ByteArray,
-        val walletRemainingSignatures: Int,
-        val walletSignedHashes: Int
+    val cardId: String,
+    val signature: ByteArray,
+    val walletRemainingSignatures: Int,
+    val walletSignedHashes: Int
 ) : CommandResponse
 
 /**
@@ -32,60 +30,44 @@ class SignResponse(
  * @property hashes Array of transaction hashes.
  * @property cardId CID, Unique Tangem card ID number
  */
-class SignCommand(private val hashes: Array<ByteArray>)
-    : Command<SignResponse>() {
+class SignCommand(private val hashes: Array<ByteArray>) : Command<SignResponse>() {
+
+    //TODO: Allow signing more than 10 hashes
 
     private val hashSizes = if (hashes.isNotEmpty()) hashes.first().size else 0
 
-    override fun performPreCheck(session: CardSession, callback: (result: CompletionResult<SignResponse>) -> Unit): Boolean {
-        if (session.environment.card?.status == CardStatus.NotPersonalized) {
-            callback(CompletionResult.Failure(TangemSdkError.NotPersonalized()))
-            return true
+    override fun performPreCheck(card: Card): TangemSdkError? {
+        if (card.isActivated) {
+            return TangemSdkError.NotActivated()
         }
-        if (session.environment.card?.isActivated == true) {
-            callback(CompletionResult.Failure(TangemSdkError.NotActivated()))
-            return true
+        if (card.walletRemainingSignatures == 0) {
+            return TangemSdkError.NoRemainingSignatures()
         }
-        if (session.environment.card?.status == CardStatus.Purged) {
-            callback(CompletionResult.Failure(TangemSdkError.CardIsPurged()))
-            return true
-        }
-        if (session.environment.card?.status == CardStatus.Empty) {
-            callback(CompletionResult.Failure(TangemSdkError.CardIsEmpty()))
-            return true
-        }
-        if (session.environment.card?.walletRemainingSignatures == 0) {
-            callback(CompletionResult.Failure(TangemSdkError.NoRemainingSignatures()))
-            return true
-        }
-        if (session.environment.card?.signingMethods?.contains(SigningMethod.SignHash) != true) {
-            callback(CompletionResult.Failure(TangemSdkError.SignHashesNotAvailable()))
-            return true
+        if (card.signingMethods?.contains(SigningMethod.SignHash) != true) {
+            return TangemSdkError.SignHashesNotAvailable()
         }
         if (hashSizes == 0) {
-            callback(CompletionResult.Failure(TangemSdkError.EmptyHashes()))
-            return true
+            return TangemSdkError.EmptyHashes()
         }
         if (hashes.any { it.size != hashSizes }) {
-            callback(CompletionResult.Failure(TangemSdkError.HashSizeMustBeEqual()))
-            return true
+            return TangemSdkError.HashSizeMustBeEqual()
+        }
+
+        return when (card.status) {
+            CardStatus.Loaded -> null
+            CardStatus.Empty -> TangemSdkError.
+            CardIsEmpty()
+            CardStatus.NotPersonalized -> TangemSdkError.NotPersonalized()
+            CardStatus.Purged -> TangemSdkError.CardIsPurged()
+            null -> TangemSdkError.CardError()
         }
-        return false
     }
 
-    override fun performAfterCheck(session: CardSession,
-                                   result: CompletionResult<SignResponse>,
-                                   callback: (result: CompletionResult<SignResponse>) -> Unit): Boolean {
-        when (result) {
-            is CompletionResult.Failure -> {
-                if (result.error is TangemSdkError.InvalidParams) {
-                    callback(CompletionResult.Failure(TangemSdkError.Pin2OrCvcRequired()))
-                    return true
-                }
-                return false
-            }
-            else -> return false
+    override fun performAfterCheck(card: Card?, error: TangemSdkError): TangemSdkError? {
+        if (error is TangemSdkError.InvalidParams) {
+            return TangemSdkError.Pin2OrCvcRequired()
         }
+        return null
     }
 
     override fun serialize(environment: SessionEnvironment): CommandApdu {
@@ -103,16 +85,9 @@ class SignCommand(private val hashes: Array<ByteArray>)
     }
 
     private fun flattenHashes(): ByteArray {
-        checkForErrors()
         return hashes.reduce { arr1, arr2 -> arr1 + arr2 }
     }
 
-    private fun checkForErrors() {
-        if (hashes.isEmpty()) throw TangemSdkError.EmptyHashes()
-        if (hashes.size > 10) throw TangemSdkError.TooManyHashesInOneTransaction()
-        if (hashes.any { it.size != hashSizes }) throw TangemSdkError.HashSizeMustBeEqual()
-    }
-
     /**
      * Application can optionally submit a public key Terminal_PublicKey in [SignCommand].
      * Submitted key is stored by the Tangem card if it differs from a previous submitted Terminal_PublicKey.
@@ -121,7 +96,8 @@ class SignCommand(private val hashes: Array<ByteArray>)
      * (this key should be generated and securily stored by the application).
      */
     private fun addTerminalSignature(
-            environment: SessionEnvironment, dataToSign: ByteArray, tlvBuilder: TlvBuilder) {
+        environment: SessionEnvironment, dataToSign: ByteArray, tlvBuilder: TlvBuilder
+    ) {
         environment.terminalKeys?.let { terminalKeyPair ->
             val signedData = dataToSign.sign(terminalKeyPair.privateKey)
             tlvBuilder.append(TlvTag.TerminalTransactionSignature, signedData)
@@ -134,10 +110,10 @@ class SignCommand(private val hashes: Array<ByteArray>)
 
         val decoder = TlvDecoder(tlvData)
         return SignResponse(
-                cardId = decoder.decode(TlvTag.CardId),
-                signature = decoder.decode(TlvTag.Signature),
-                walletRemainingSignatures = decoder.decode(TlvTag.RemainingSignatures),
-                walletSignedHashes = decoder.decode(TlvTag.SignedHashes)
+            cardId = decoder.decode(TlvTag.CardId),
+            signature = decoder.decode(TlvTag.Signature),
+            walletRemainingSignatures = decoder.decode(TlvTag.RemainingSignatures),
+            walletSignedHashes = decoder.decode(TlvTag.SignedHashes)
         )
     }
 }

tangem-core/src/main/java/com/tangem/commands/WriteIssuerDataCommand.kt

@@ -1,13 +1,11 @@
 package com.tangem.commands
 
-import com.tangem.CardSession
 import com.tangem.SessionEnvironment
 import com.tangem.TangemSdkError
 import com.tangem.commands.common.DefaultIssuerDataVerifier
 import com.tangem.commands.common.IssuerDataMode
 import com.tangem.commands.common.IssuerDataToVerify
 import com.tangem.commands.common.IssuerDataVerifier
-import com.tangem.common.CompletionResult
 import com.tangem.common.apdu.CommandApdu
 import com.tangem.common.apdu.Instruction
 import com.tangem.common.apdu.ResponseApdu
@@ -16,10 +14,10 @@ import com.tangem.common.tlv.TlvDecoder
 import com.tangem.common.tlv.TlvTag
 
 class WriteIssuerDataResponse(
-        /**
-         * CID, Unique Tangem card ID number.
-         */
-        val cardId: String
+    /**
+     * CID, Unique Tangem card ID number.
+     */
+    val cardId: String
 ) : CommandResponse
 
 /**
@@ -33,75 +31,53 @@ class WriteIssuerDataResponse(
  * @property issuerDataCounter An optional counter that protect issuer data against replay attack.
  */
 class WriteIssuerDataCommand(
-        private val issuerData: ByteArray,
-        private val issuerDataSignature: ByteArray,
-        private val issuerDataCounter: Int? = null,
-        private val issuerPublicKey: ByteArray? = null,
-        verifier: IssuerDataVerifier = DefaultIssuerDataVerifier()
+    private val issuerData: ByteArray,
+    private val issuerDataSignature: ByteArray,
+    private val issuerDataCounter: Int? = null,
+    private val issuerPublicKey: ByteArray? = null,
+    verifier: IssuerDataVerifier = DefaultIssuerDataVerifier()
 ) : Command<WriteIssuerDataResponse>(), IssuerDataVerifier by verifier {
 
-    override fun performPreCheck(session: CardSession, callback: (result: CompletionResult<WriteIssuerDataResponse>) -> Unit): Boolean {
-        val card = session.environment.card
-        if (card == null) {
-            callback(CompletionResult.Failure(TangemSdkError.MissingPreflightRead()))
-            return true
-        }
+    override fun performPreCheck(card: Card): TangemSdkError? {
         val publicKey = issuerPublicKey ?: card.issuerPublicKey
-        if (publicKey == null) {
-            callback(CompletionResult.Failure(TangemSdkError.MissingIssuerPubicKey()))
-            return true
+        ?: return TangemSdkError.MissingIssuerPubicKey()
+
+        if (card.status == CardStatus.NotPersonalized) {
+            return TangemSdkError.NotPersonalized()
         }
-        if (session.environment.card?.status == CardStatus.NotPersonalized) {
-            callback(CompletionResult.Failure(TangemSdkError.NotPersonalized()))
-            return true
-        }
-        if (session.environment.card?.isActivated == true) {
-            callback(CompletionResult.Failure(TangemSdkError.NotActivated()))
-            return true
+        if (card.isActivated) {
+            return TangemSdkError.NotActivated()
         }
         if (issuerData.size > MAX_SIZE) {
-            callback(CompletionResult.Failure(TangemSdkError.DataSizeTooLarge()))
-            return true
+            return TangemSdkError.DataSizeTooLarge()
         }
         if (!isCounterValid(issuerDataCounter, card)) {
-            callback(CompletionResult.Failure(TangemSdkError.MissingCounter()))
-            return true
+            return TangemSdkError.MissingCounter()
         }
         if (!verifySignature(publicKey, card.cardId)) {
-            callback(CompletionResult.Failure(TangemSdkError.VerificationFailed()))
-            return true
+            return TangemSdkError.VerificationFailed()
         }
-        return false
+        return null
     }
 
-    override fun performAfterCheck(session: CardSession,
-                                   result: CompletionResult<WriteIssuerDataResponse>,
-                                   callback: (result: CompletionResult<WriteIssuerDataResponse>) -> Unit
-    ): Boolean {
-        when (result) {
-            is CompletionResult.Failure -> {
-                if (result.error is TangemSdkError.InvalidParams &&
-                        isCounterRequired(session.environment.card)) {
-                    callback(CompletionResult.Failure(TangemSdkError.DataCannotBeWritten()))
-                    return true
-                }
-                return false
-            }
-            else -> return false
+    override fun performAfterCheck(card: Card?, error: TangemSdkError): TangemSdkError? {
+        if (error is TangemSdkError.InvalidParams && isCounterRequired(card)) {
+            return TangemSdkError.DataCannotBeWritten()
         }
+        return null
     }
 
     private fun isCounterValid(issuerDataCounter: Int?, card: Card): Boolean =
-            if (isCounterRequired(card)) issuerDataCounter != null else true
+        if (isCounterRequired(card)) issuerDataCounter != null else true
 
     private fun isCounterRequired(card: Card?): Boolean =
-            card?.settingsMask?.contains(Settings.ProtectIssuerDataAgainstReplay) != false
+        card?.settingsMask?.contains(Settings.ProtectIssuerDataAgainstReplay) == true
 
     private fun verifySignature(publicKey: ByteArray, cardId: String): Boolean {
         return verify(
-                publicKey,
-                issuerDataSignature,
-                IssuerDataToVerify(cardId, issuerData, issuerDataCounter)
+            publicKey,
+            issuerDataSignature,
+            IssuerDataToVerify(cardId, issuerData, issuerDataCounter)
         )
     }
 
@@ -117,12 +93,15 @@ class WriteIssuerDataCommand(
         return CommandApdu(Instruction.WriteIssuerData, tlvBuilder.serialize())
     }
 
-    override fun deserialize(environment: SessionEnvironment, apdu: ResponseApdu): WriteIssuerDataResponse {
+    override fun deserialize(
+        environment: SessionEnvironment,
+        apdu: ResponseApdu
+    ): WriteIssuerDataResponse {
         val tlvData = apdu.getTlvData() ?: throw TangemSdkError.DeserializeApduFailed()
 
         val decoder = TlvDecoder(tlvData)
         return WriteIssuerDataResponse(
-                cardId = decoder.decode(TlvTag.CardId)
+            cardId = decoder.decode(TlvTag.CardId)
         )
     }
 

tangem-core/src/main/java/com/tangem/commands/WriteIssuerExtraDataCommand.kt

@@ -32,89 +32,64 @@ import com.tangem.common.tlv.TlvTag
  * @param issuerDataCounter An optional counter that protect issuer data against replay attack.
  */
 class WriteIssuerExtraDataCommand(
-        private val issuerData: ByteArray,
-        private val startingSignature: ByteArray,
-        private val finalizingSignature: ByteArray,
-        private val issuerDataCounter: Int? = null,
-        private val issuerPublicKey: ByteArray? = null,
-        verifier: IssuerDataVerifier = DefaultIssuerDataVerifier()
+    private val issuerData: ByteArray,
+    private val startingSignature: ByteArray,
+    private val finalizingSignature: ByteArray,
+    private val issuerDataCounter: Int? = null,
+    private val issuerPublicKey: ByteArray? = null,
+    verifier: IssuerDataVerifier = DefaultIssuerDataVerifier()
 ) : Command<WriteIssuerDataResponse>(), IssuerDataVerifier by verifier {
 
     var mode: IssuerDataMode = IssuerDataMode.InitializeWritingExtraData
     var offset: Int = 0
 
-    override fun run(session: CardSession, callback: (result: CompletionResult<WriteIssuerDataResponse>) -> Unit) {
-        val card = session.environment.card
-        if (card == null) {
-            callback(CompletionResult.Failure(TangemSdkError.MissingPreflightRead()))
-            return
-        }
-        val publicKey = issuerPublicKey ?: card.issuerPublicKey
-        if (publicKey == null) {
-            callback(CompletionResult.Failure(TangemSdkError.MissingIssuerPubicKey()))
-            return
-        }
-
-        writeIssuerData(session, card.cardId, publicKey) { response ->
-            when (response) {
-                is CompletionResult.Success -> callback(response)
-                is CompletionResult.Failure -> {
-                    if (response.error is TangemSdkError.InvalidParams && isCounterRequired(card)) {
-                        callback(CompletionResult.Failure(TangemSdkError.DataCannotBeWritten()))
-                        return@writeIssuerData
-                    }
-                    if (response.error is TangemSdkError.InvalidState &&
-                            card.settingsMask?.contains(Settings.ProtectIssuerDataAgainstReplay) != false) {
-                        callback(CompletionResult.Failure(TangemSdkError.OverwritingDataIsProhibited()))
-                        return@writeIssuerData
-                    }
-                }
-            }
-        }
+    override fun run(
+        session: CardSession,
+        callback: (result: CompletionResult<WriteIssuerDataResponse>) -> Unit
+    ) {
+        writeIssuerData(session, callback)
     }
 
-    override fun performPreCheck(session: CardSession, callback: (result: CompletionResult<WriteIssuerDataResponse>) -> Unit): Boolean {
-        val card = session.environment.card
-        if (card == null) {
-            callback(CompletionResult.Failure(TangemSdkError.MissingPreflightRead()))
-            return true
-        }
+    override fun performPreCheck(card: Card): TangemSdkError? {
         val publicKey = issuerPublicKey ?: card.issuerPublicKey
-        if (publicKey == null) {
-            callback(CompletionResult.Failure(TangemSdkError.MissingIssuerPubicKey()))
-            return true
-        }
+        ?: return TangemSdkError.MissingIssuerPubicKey()
 
-        if (session.environment.card?.status == CardStatus.NotPersonalized) {
-            callback(CompletionResult.Failure(TangemSdkError.NotPersonalized()))
-            return true
+        if (card.status == CardStatus.NotPersonalized) {
+            return TangemSdkError.NotPersonalized()
         }
-        if (session.environment.card?.isActivated == true) {
-            callback(CompletionResult.Failure(TangemSdkError.NotActivated()))
-            return true
+        if (card.isActivated) {
+            return TangemSdkError.NotActivated()
         }
         if (issuerData.size > MAX_SIZE) {
-            callback(CompletionResult.Failure(TangemSdkError.ExendedDataSizeTooLarge()))
-            return true
+            return TangemSdkError.DataSizeTooLarge()
         }
         if (!isCounterValid(issuerDataCounter, card)) {
-            callback(CompletionResult.Failure(TangemSdkError.MissingCounter()))
-            return true
+            return TangemSdkError.MissingCounter()
         }
-        if (!verifySignatures(card.cardId, publicKey)) {
-            callback(CompletionResult.Failure(TangemSdkError.VerificationFailed()))
-            return true
+        if (!verifySignatures(publicKey, card.cardId)) {
+            return TangemSdkError.VerificationFailed()
         }
-        return false
+        return null
+    }
+
+    override fun performAfterCheck(card: Card?, error: TangemSdkError): TangemSdkError? {
+        if (error is TangemSdkError.InvalidParams && isCounterRequired(card)) {
+            return TangemSdkError.DataCannotBeWritten()
+        }
+        if (error is TangemSdkError.InvalidState &&
+            card?.settingsMask?.contains(Settings.ProtectIssuerDataAgainstReplay) == true) {
+            return TangemSdkError.OverwritingDataIsProhibited()
+        }
+        return null
     }
 
     private fun isCounterValid(issuerDataCounter: Int?, card: Card): Boolean =
-            if (isCounterRequired(card)) issuerDataCounter != null else true
+        if (isCounterRequired(card)) issuerDataCounter != null else true
 
-    private fun isCounterRequired(card: Card): Boolean =
-            card.settingsMask?.contains(Settings.ProtectIssuerDataAgainstReplay) != false
+    private fun isCounterRequired(card: Card?): Boolean =
+        card?.settingsMask?.contains(Settings.ProtectIssuerDataAgainstReplay) == true
 
-    private fun verifySignatures(cardId: String, publicKey: ByteArray): Boolean {
+    private fun verifySignatures(publicKey: ByteArray, cardId: String): Boolean {
 
         val firstData = IssuerDataToVerify(cardId, null, issuerDataCounter, issuerData.size)
         val secondData = IssuerDataToVerify(cardId, issuerData, issuerDataCounter)
@@ -124,13 +99,16 @@ class WriteIssuerExtraDataCommand(
     }
 
     private fun writeIssuerData(
-            session: CardSession,
-            cardId: String, publicKey: ByteArray,
-            callback: (result: CompletionResult<WriteIssuerDataResponse>) -> Unit
+        session: CardSession,
+        callback: (result: CompletionResult<WriteIssuerDataResponse>) -> Unit
     ) {
 
         if (mode == IssuerDataMode.WriteExtraData) {
-            session.viewDelegate.onDelay(issuerData.size, offset, WriteIssuerExtraDataCommand.SINGLE_WRITE_SIZE)
+            session.viewDelegate.onDelay(
+                issuerData.size,
+                offset,
+                SINGLE_WRITE_SIZE
+            )
         }
         transceive(session) { result ->
             when (result) {
@@ -138,7 +116,7 @@ class WriteIssuerExtraDataCommand(
                     when (mode) {
                         IssuerDataMode.InitializeWritingExtraData -> {
                             mode = IssuerDataMode.WriteExtraData
-                            writeIssuerData(session, cardId, publicKey, callback)
+                            writeIssuerData(session, callback)
                             return@transceive
                         }
                         IssuerDataMode.WriteExtraData -> {
@@ -146,7 +124,7 @@ class WriteIssuerExtraDataCommand(
                             if (offset >= issuerData.size) {
                                 mode = IssuerDataMode.FinalizeExtraData
                             }
-                            writeIssuerData(session, cardId, publicKey, callback)
+                            writeIssuerData(session, callback)
                             return@transceive
                         }
                         IssuerDataMode.FinalizeExtraData -> {
@@ -155,6 +133,11 @@ class WriteIssuerExtraDataCommand(
                     }
                 }
                 is CompletionResult.Failure -> {
+                    if (session.environment.handleErrors) {
+                        performAfterCheck(session.environment.card, result.error)?.let {
+                            callback(CompletionResult.Failure(it))
+                        }
+                    }
                     callback(CompletionResult.Failure(result.error))
                 }
             }
@@ -188,17 +171,21 @@ class WriteIssuerExtraDataCommand(
     }
 
     private fun getDataToWrite(): ByteArray =
-            issuerData.copyOfRange(offset, offset + calculatePartSize())
+        issuerData.copyOfRange(offset, offset + calculatePartSize())
 
     private fun calculatePartSize(): Int {
         val bytesLeft = issuerData.size - offset
         return if (bytesLeft < SINGLE_WRITE_SIZE) bytesLeft else SINGLE_WRITE_SIZE
     }
 
-    override fun deserialize(environment: SessionEnvironment, apdu: ResponseApdu): WriteIssuerDataResponse {
+    override fun deserialize(
+        environment: SessionEnvironment,
+        apdu: ResponseApdu
+    ): WriteIssuerDataResponse {
         val tlvData = apdu.getTlvData() ?: throw TangemSdkError.DeserializeApduFailed()
 
-        return WriteIssuerDataResponse(cardId = TlvDecoder(tlvData).decode(TlvTag.CardId)
+        return WriteIssuerDataResponse(
+            cardId = TlvDecoder(tlvData).decode(TlvTag.CardId)
         )
     }
 

tangem-core/src/main/java/com/tangem/commands/WriteUserDataCommand.kt

@@ -1,9 +1,7 @@
 package com.tangem.commands
 
-import com.tangem.CardSession
 import com.tangem.SessionEnvironment
 import com.tangem.TangemSdkError
-import com.tangem.common.CompletionResult
 import com.tangem.common.apdu.CommandApdu
 import com.tangem.common.apdu.Instruction
 import com.tangem.common.apdu.ResponseApdu
@@ -34,36 +32,24 @@ class WriteUserDataCommand(private val userData: ByteArray? = null, private val
                            private val userCounter: Int? = null,
                            private val userProtectedCounter: Int? = null) : Command<WriteUserDataResponse>() {
 
-    override fun performPreCheck(session: CardSession, callback: (result: CompletionResult<WriteUserDataResponse>) -> Unit): Boolean {
-        if (session.environment.card?.status == CardStatus.NotPersonalized) {
-            callback(CompletionResult.Failure(TangemSdkError.NotPersonalized()))
-            return true
+    override fun performPreCheck(card: Card): TangemSdkError? {
+        if (card.status == CardStatus.NotPersonalized) {
+            return TangemSdkError.NotPersonalized()
         }
-        if (session.environment.card?.isActivated == true) {
-            callback(CompletionResult.Failure(TangemSdkError.NotActivated()))
-            return true
+        if (card.isActivated) {
+            return TangemSdkError.NotActivated()
         }
         if (userData?.size ?: 0 > MAX_SIZE || userProtectedData?.size ?: 0 > MAX_SIZE) {
-            callback(CompletionResult.Failure(TangemSdkError.DataSizeTooLarge()))
-            return true
+            return TangemSdkError.DataSizeTooLarge()
         }
-        return false
+        return null
     }
 
-    override fun performAfterCheck(session: CardSession,
-                                   result: CompletionResult<WriteUserDataResponse>,
-                                   callback: (result: CompletionResult<WriteUserDataResponse>) -> Unit
-    ): Boolean {
-        when (result) {
-            is CompletionResult.Failure -> {
-                if (result.error is TangemSdkError.InvalidParams) {
-                    callback(CompletionResult.Failure(TangemSdkError.Pin2OrCvcRequired()))
-                    return true
-                }
-                return false
-            }
-            else -> return false
+    override fun performAfterCheck(card: Card?, error: TangemSdkError): TangemSdkError? {
+        if (error is TangemSdkError.InvalidParams) {
+            return TangemSdkError.Pin2OrCvcRequired()
         }
+        return null
     }
 
     override fun serialize(environment: SessionEnvironment): CommandApdu {

tangem-core/src/main/java/com/tangem/commands/personalization/PersonalizeCommand.kt

@@ -9,7 +9,6 @@ import com.tangem.commands.CardStatus
 import com.tangem.commands.Command
 import com.tangem.commands.common.CardDeserializer
 import com.tangem.commands.personalization.entities.*
-import com.tangem.common.CompletionResult
 import com.tangem.common.apdu.CommandApdu
 import com.tangem.common.apdu.Instruction
 import com.tangem.common.apdu.ResponseApdu
@@ -38,12 +37,11 @@ class PersonalizeCommand(
         private val acquirer: Acquirer? = null
 ) : Command<Card>() {
 
-    override fun performPreCheck(session: CardSession, callback: (result: CompletionResult<Card>) -> Unit): Boolean {
-        if (session.environment.card?.status != CardStatus.NotPersonalized) {
-            callback(CompletionResult.Failure(TangemSdkError.AlreadyPersonalized()))
-            return true
+    override fun performPreCheck(card: Card): TangemSdkError? {
+        if (card.status != CardStatus.NotPersonalized) {
+            return TangemSdkError.AlreadyPersonalized()
         }
-        return false
+        return null
     }
 
     override fun serialize(environment: SessionEnvironment): CommandApdu {

tangem-sdk/src/main/java/com/tangem/tangem_sdk_new/extensions/TangemSdkError.kt

@@ -40,7 +40,7 @@ fun TangemSdkError.localizedDescription(): Int {
         is TangemSdkError.Pin2OrCvcRequired -> R.string.error_operation
         is TangemSdkError.VerificationFailed -> R.string.error_verification_failed
         is TangemSdkError.DataSizeTooLarge -> R.string.error_data_size_too_large
-        is TangemSdkError.ExendedDataSizeTooLarge -> R.string.error_data_size_too_large_extended
+        is TangemSdkError.ExtendedDataSizeTooLarge -> R.string.error_data_size_too_large_extended
         is TangemSdkError.MissingCounter -> R.string.error_missing_counter
         is TangemSdkError.OverwritingDataIsProhibited -> R.string.error_data_cannot_be_written
         is TangemSdkError.DataCannotBeWritten -> R.string.error_data_cannot_be_written