(1) A payment transaction is authorised only if the payer concerned has consented to its execution. A payer can authorise a payment transaction before or, if agreed between the payer and the payment service provider concerned, after the execution of the payment transaction.
(2) Consent to execute a payment transaction or a series of payment transactions is valid only if given in a form agreed between the payer and payment service provider concerned.
(3) In the absence of consent, a payment transaction is unauthorised.
(4) A payer may withdraw his or her consent at any time before the time of irrevocability under Regulation 82. A payer may withdraw his or her consent to execute a series of payment transactions with the effect that any future payment transaction is unauthorised.
(5) The procedure for giving consent shall be as agreed between the payer and the payment service provider.