diff --git a/BankingClient/build.gradle.kts b/BankingClient/build.gradle.kts
new file mode 100644
index 00000000..bf453982
--- /dev/null
+++ b/BankingClient/build.gradle.kts
@@ -0,0 +1,106 @@
+@file:OptIn(ExperimentalWasmDsl::class)
+
+import org.jetbrains.kotlin.gradle.targets.js.dsl.ExperimentalWasmDsl
+
+plugins {
+    kotlin("multiplatform")
+}
+
+
+kotlin {
+    jvmToolchain(8)
+
+    jvm {
+        withJava()
+
+        testRuns["test"].executionTask.configure {
+            useJUnitPlatform()
+
+            testLogging {
+                showExceptions = true
+                showStandardStreams = true
+                events("passed", "skipped", "failed")
+                // exceptionFormat = org.gradle.api.tasks.testing.logging.TestExceptionFormat.FULL
+            }
+        }
+    }
+
+    js {
+        moduleName = "banking-client"
+        binaries.executable()
+
+        browser {
+            testTask {
+                useKarma {
+                    useChromeHeadless()
+                    useFirefoxHeadless()
+                }
+            }
+        }
+
+        nodejs {
+            testTask {
+                useMocha {
+                    timeout = "20s" // Mocha times out after 2 s, which is too short for bufferExceeded() test
+                }
+            }
+        }
+    }
+
+    wasmJs()
+
+
+    linuxX64()
+    mingwX64()
+
+    iosArm64()
+    iosSimulatorArm64()
+    macosX64()
+    macosArm64()
+    watchosArm64()
+    watchosSimulatorArm64()
+    tvosArm64()
+    tvosSimulatorArm64()
+
+    applyDefaultHierarchyTemplate()
+
+
+
+    val coroutinesVersion: String by project
+
+    sourceSets {
+        commonMain {
+            dependencies {
+                api(project(":BankingClientModel"))
+            }
+        }
+        commonTest {
+            dependencies {
+                implementation(kotlin("test"))
+            }
+        }
+
+        jvmMain {
+            dependencies {
+
+            }
+        }
+        jvmTest { }
+
+        jsMain {
+            dependencies {
+
+            }
+        }
+        jsTest {  }
+
+        nativeMain { }
+        nativeTest { }
+    }
+}
+
+
+
+ext["customArtifactId"] = "banking-client"
+
+apply(from = "../gradle/scripts/publish-codinux.gradle.kts")
\ No newline at end of file
diff --git a/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BankingClient.kt b/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BankingClient.kt
new file mode 100644
index 00000000..20bd14a7
--- /dev/null
+++ b/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BankingClient.kt
@@ -0,0 +1,19 @@
+package net.codinux.banking.client
+
+import net.codinux.banking.client.model.AccountCredentials
+import net.codinux.banking.client.model.options.GetAccountDataOptions
+import net.codinux.banking.client.model.response.GetAccountDataResponse
+import net.codinux.banking.client.model.response.Response
+
+interface BankingClient {
+
+    suspend fun getAccountDataAsync(bankCode: String, loginName: String, password: String) =
+        getAccountDataAsync(AccountCredentials(bankCode, loginName, password))
+
+    // for languages not supporting default parameters (Java, Swift, JS, ...)
+    suspend fun getAccountDataAsync(credentials: AccountCredentials) =
+        getAccountDataAsync(credentials, GetAccountDataOptions())
+
+    suspend fun getAccountDataAsync(credentials: AccountCredentials, options: GetAccountDataOptions): Response<GetAccountDataResponse>
+
+}
\ No newline at end of file
diff --git a/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BankingClientForCustomer.kt b/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BankingClientForCustomer.kt
new file mode 100644
index 00000000..e73228f8
--- /dev/null
+++ b/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BankingClientForCustomer.kt
@@ -0,0 +1,14 @@
+package net.codinux.banking.client
+
+import net.codinux.banking.client.model.options.GetAccountDataOptions
+import net.codinux.banking.client.model.response.GetAccountDataResponse
+import net.codinux.banking.client.model.response.Response
+
+interface BankingClientForCustomer {
+
+    // for languages not supporting default parameters (Java, Swift, JS, ...)
+    suspend fun getAccountDataAsync() = getAccountDataAsync(GetAccountDataOptions())
+
+    suspend fun getAccountDataAsync(options: GetAccountDataOptions): Response<GetAccountDataResponse>
+
+}
\ No newline at end of file
diff --git a/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BankingClientForCustomerBase.kt b/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BankingClientForCustomerBase.kt
new file mode 100644
index 00000000..395cef53
--- /dev/null
+++ b/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BankingClientForCustomerBase.kt
@@ -0,0 +1,14 @@
+package net.codinux.banking.client
+
+import net.codinux.banking.client.model.AccountCredentials
+import net.codinux.banking.client.model.options.GetAccountDataOptions
+
+abstract class BankingClientForCustomerBase(
+    protected val credentials: AccountCredentials,
+    protected val client: BankingClient
+) : BankingClientForCustomer {
+
+    override suspend fun getAccountDataAsync(options: GetAccountDataOptions) =
+        client.getAccountDataAsync(credentials, options)
+
+}
\ No newline at end of file
diff --git a/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BlockingBankingClient.kt b/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BlockingBankingClient.kt
new file mode 100644
index 00000000..74c6e19b
--- /dev/null
+++ b/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BlockingBankingClient.kt
@@ -0,0 +1,19 @@
+package net.codinux.banking.client
+
+import net.codinux.banking.client.model.AccountCredentials
+import net.codinux.banking.client.model.options.GetAccountDataOptions
+import net.codinux.banking.client.model.response.GetAccountDataResponse
+import net.codinux.banking.client.model.response.Response
+
+interface BlockingBankingClient {
+
+    suspend fun getAccountData(bankCode: String, loginName: String, password: String) =
+        getAccountData(AccountCredentials(bankCode, loginName, password))
+
+    // for languages not supporting default parameters (Java, Swift, JS, ...)
+    fun getAccountData(credentials: AccountCredentials) =
+        getAccountData(credentials, GetAccountDataOptions())
+
+    fun getAccountData(credentials: AccountCredentials, options: GetAccountDataOptions): Response<GetAccountDataResponse>
+
+}
\ No newline at end of file
diff --git a/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BlockingBankingClientForCustomer.kt b/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BlockingBankingClientForCustomer.kt
new file mode 100644
index 00000000..f8312267
--- /dev/null
+++ b/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BlockingBankingClientForCustomer.kt
@@ -0,0 +1,14 @@
+package net.codinux.banking.client
+
+import net.codinux.banking.client.model.options.GetAccountDataOptions
+import net.codinux.banking.client.model.response.GetAccountDataResponse
+import net.codinux.banking.client.model.response.Response
+
+interface BlockingBankingClientForCustomer {
+
+    // for languages not supporting default parameters (Java, Swift, JS, ...)
+    fun getAccountData() = getAccountData(GetAccountDataOptions())
+
+    fun getAccountData(options: GetAccountDataOptions): Response<GetAccountDataResponse>
+
+}
\ No newline at end of file
diff --git a/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BlockingBankingClientForCustomerBase.kt b/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BlockingBankingClientForCustomerBase.kt
new file mode 100644
index 00000000..484fe19b
--- /dev/null
+++ b/BankingClient/src/commonMain/kotlin/net/codinux/banking/client/BlockingBankingClientForCustomerBase.kt
@@ -0,0 +1,14 @@
+package net.codinux.banking.client
+
+import net.codinux.banking.client.model.AccountCredentials
+import net.codinux.banking.client.model.options.GetAccountDataOptions
+
+abstract class BlockingBankingClientForCustomerBase(
+    protected val credentials: AccountCredentials,
+    protected val client: BlockingBankingClient
+) : BlockingBankingClientForCustomer {
+
+    override fun getAccountData(options: GetAccountDataOptions) =
+        client.getAccountData(credentials, options)
+
+}
\ No newline at end of file
diff --git a/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/options/GetAccountDataOptions.kt b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/options/GetAccountDataOptions.kt
new file mode 100644
index 00000000..cb1b5da6
--- /dev/null
+++ b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/options/GetAccountDataOptions.kt
@@ -0,0 +1,11 @@
+package net.codinux.banking.client.model.options
+
+import kotlinx.datetime.LocalDate
+
+data class GetAccountDataOptions(
+    val retrieveBalance: Boolean = true,
+    val retrieveTransactions: RetrieveTransactions = RetrieveTransactions.OfLast90Days,
+    val retrieveTransactionsFrom: LocalDate? = null,
+    val retrieveTransactionsTo: LocalDate? = null,
+    val abortIfTanIsRequired: Boolean = false
+)
\ No newline at end of file
diff --git a/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/options/RetrieveTransactions.kt b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/options/RetrieveTransactions.kt
new file mode 100644
index 00000000..e20b5246
--- /dev/null
+++ b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/options/RetrieveTransactions.kt
@@ -0,0 +1,18 @@
+package net.codinux.banking.client.model.options
+
+enum class RetrieveTransactions {
+    No,
+
+    All,
+
+    /**
+     * Some banks support that according to PSD2 account transactions of last 90 days may be retrieved without
+     * a TAN (= no strong customer authorization needed). So try this options if you don't want to enter a TAN.
+     */
+    OfLast90Days,
+
+    /**
+     * Retrieves account transactions in the boundaries of [GetAccountDataOptions.retrieveTransactionsFrom] to [GetAccountDataOptions.retrieveTransactionsTo].
+     */
+    AccordingToRetrieveFromAndTo
+}
\ No newline at end of file
diff --git a/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/Error.kt b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/Error.kt
new file mode 100644
index 00000000..efb9964c
--- /dev/null
+++ b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/Error.kt
@@ -0,0 +1,19 @@
+package net.codinux.banking.client.model.response
+
+import net.codinux.banking.client.model.config.NoArgConstructor
+
+@NoArgConstructor
+class Error(
+    val type: ErrorType,
+
+    /**
+     * A banking client internal error like an error occurred during response parsing.
+     */
+    val internalError: String? = null,
+    /**
+     * Error messages as received from bank
+     */
+    val errorMessagesFromBank: List<String> = emptyList(),
+) {
+    override fun toString() = "$type: ${internalError ?: errorMessagesFromBank.joinToString()}"
+}
\ No newline at end of file
diff --git a/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/ErrorType.kt b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/ErrorType.kt
new file mode 100644
index 00000000..0ab62f47
--- /dev/null
+++ b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/ErrorType.kt
@@ -0,0 +1,33 @@
+package net.codinux.banking.client.model.response
+
+enum class ErrorType {
+    BankDoesNotSupportFinTs3,
+
+    NetworkError,
+
+    InternalError,
+
+    BankReturnedError,
+
+    WrongCredentials,
+
+    AccountLocked,
+
+    JobNotSupported,
+
+    UserCancelledAction,
+
+    TanRequiredButShouldAbortIfRequiresTan,
+
+    NoneOfTheAccountsSupportsRetrievingData,
+
+    DidNotRetrieveAllAccountData,
+
+    CanNotDetermineBicForIban,
+
+    NoAccountSupportsMoneyTransfer,
+
+    MoreThanOneAccountSupportsMoneyTransfer,
+
+    UnknownError
+}
\ No newline at end of file
diff --git a/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/GetAccountDataResponse.kt b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/GetAccountDataResponse.kt
new file mode 100644
index 00000000..a0a9d7f0
--- /dev/null
+++ b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/GetAccountDataResponse.kt
@@ -0,0 +1,16 @@
+package net.codinux.banking.client.model.response
+
+import net.codinux.banking.client.model.AccountTransaction
+import net.codinux.banking.client.model.CustomerAccount
+import net.codinux.banking.client.model.config.NoArgConstructor
+
+@NoArgConstructor
+class GetAccountDataResponse(
+    val customer: CustomerAccount
+) {
+
+    val bookedTransactions: List<AccountTransaction>
+        get() = customer.accounts.flatMap { it.bookedTransactions }.sortedByDescending { it.valueDate }
+
+    override fun toString() = customer.toString()
+}
\ No newline at end of file
diff --git a/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/Response.kt b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/Response.kt
new file mode 100644
index 00000000..88f7335c
--- /dev/null
+++ b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/Response.kt
@@ -0,0 +1,30 @@
+package net.codinux.banking.client.model.response
+
+import net.codinux.banking.client.model.config.NoArgConstructor
+
+@NoArgConstructor
+class Response<T> (
+    val type: ResponseType,
+    val data: T? = null,
+    val error: Error? = null,
+    val tanRequired: TanRequired? = null
+) {
+
+    companion object {
+        fun <T> success(data: T): Response<T> =
+            Response(ResponseType.Success, data)
+
+        fun <T> error(errorType: ErrorType, internalError: String? = null, errorMessagesFromBank: List<String> = emptyList()): Response<T> =
+            Response(ResponseType.Error, null, Error(errorType, internalError, errorMessagesFromBank))
+
+        fun <T> bankReturnedError(errorMessagesFromBank: List<String>): Response<T> =
+            Response.error(ErrorType.BankReturnedError, null, errorMessagesFromBank)
+    }
+
+
+    override fun toString() = when (type) {
+        ResponseType.Success -> "Success: $data"
+        ResponseType.Error -> "Error: $error"
+        ResponseType.TanRequired -> "TanRequired: $tanRequired"
+    }
+}
\ No newline at end of file
diff --git a/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/ResponseType.kt b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/ResponseType.kt
new file mode 100644
index 00000000..13fb0990
--- /dev/null
+++ b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/ResponseType.kt
@@ -0,0 +1,9 @@
+package net.codinux.banking.client.model.response
+
+enum class ResponseType {
+    Success,
+
+    Error,
+
+    TanRequired
+}
\ No newline at end of file
diff --git a/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/TanRequired.kt b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/TanRequired.kt
new file mode 100644
index 00000000..9c13f24a
--- /dev/null
+++ b/BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/response/TanRequired.kt
@@ -0,0 +1,12 @@
+package net.codinux.banking.client.model.response
+
+import net.codinux.banking.client.model.config.NoArgConstructor
+
+@NoArgConstructor
+class TanRequired (
+    val tanRequestId: String,
+    // TODO: add TAN model
+//    val tanChallenge: TanChallenge
+) {
+
+}
\ No newline at end of file
diff --git a/build.gradle.kts b/build.gradle.kts
index 03f614b0..fcfb170a 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -27,12 +27,14 @@ allprojects {
 
 tasks.register("publishAllToMavenLocal") {
     dependsOn(
-        ":BankingClientModel:publishToMavenLocal"
+        ":BankingClientModel:publishToMavenLocal",
+        ":BankingClient:publishToMavenLocal"
     )
 }
 
 tasks.register("publishAll") {
     dependsOn(
-        ":BankingClientModel:publish"
+        ":BankingClientModel:publish",
+        ":BankingClient:publish"
     )
 }
\ No newline at end of file
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 232c9fe4..79c93aee 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -21,6 +21,8 @@ plugins {
 }
 
 
-rootProject.name = "BankingClient"
+rootProject.name = "BankingClientProject"
+
 
 include("BankingClientModel")
+include("BankingClient")