The payer and his payment service provider may agree in the deposit account agreement or in the framework agreement for payment services that the payer is not entitled to a refund where he has given his consent to the execution of the payment transaction directly to his payment service provider and, where applicable, the information relating to the future payment transaction has been provided to the payer or made available to him in the agreed manner, at least four weeks before the due date, by the payment service provider or by the payee.