You can mark a request and transaction as demo using the parameter demo. If marked so, the payment is not actually processed. There are also no transaction costs, shipments, nor statement positions.
Always test Sofort payments with 88888888 (eight times 8) as IBAN or BIC. Otherwise, the payment will be executed even if the transaction was created in demo mode or on our test servers. Please make sure this is considered when working with demo transactions or on test servers.
If the parameter is transmitted with the value 1 or true, it is a demo transaction. If the parameter is omitted, or transmitted with 0 or false, it is a real transaction.