(1) A payment transaction is to be regarded as having been authorised by the payer for the purposes of this Part only if the payer has given its consent to -
(a) the execution of the payment transaction; or
(b) the execution of a series of payment transactions of which that payment transaction forms part.
(2) Such consent -
(a) may be given before or, if agreed between the payer and its payment service provider, after the execution of the payment transaction;
(b) must be given in the form, and in accordance with the procedure, agreed between the payer and its payment service provider; and
(c) may be given via the payee or a payment initiation service provider.
(3) The payer may withdraw its consent to a payment transaction at any time before the point at which the payment order can no longer be revoked under regulation 83 (revocation of a payment order).
(4) Subject to regulation 83(3) to (5), the payer may withdraw its consent to the execution of a series of payment transactions at an
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