Also implemented an identifier for AccountTransaction

BankingClientModel/src/commonMain/kotlin/net/codinux/banking/client/model/AccountTransaction.kt

@@ -66,5 +66,9 @@ open class AccountTransaction(
     val reference: String
         get() = sepaReference ?: unparsedReference
 
+    open val identifier by lazy {
+        "$amount $currency $bookingDate $valueDate $unparsedReference $sepaReference $otherPartyName $otherPartyBankCode $otherPartyAccountId"
+    }
+
     override fun toString() = "${valueDate.dayOfMonth}.${valueDate.monthNumber}.${valueDate.year} ${amount.toString().padStart(4, ' ')} ${if (currency == "EUR") "€" else currency} ${otherPartyName ?: ""} - $reference"
 }