(1) Where the conditions in paragraph (2) and the requirement in regulation 64(1) are satisfied, the payer is entitled to a refund from its payment service provider of the full amount of any authorised payment transaction initiated by or through the payee.
(2) The conditions are that -
(a) the authorisation did not specify the exact amount of the payment transaction when the authorisation was given in accordance with regulation 55; and
(b) the amount of the payment transaction exceeded the amount that the payer could reasonably have expected taking into account the payer's previous spending pattern, the conditions of the framework contract and the circumstances of the case.
(3) The payer and payment service provider may agree in the framework contract, in respect of direct debits, that the conditions in paragraph (2) need not be satisfied in order for the payer to be entitled to a refund.
(4) For the purposes of paragraph (2)(b), the payer cannot rely on currency exchange fluctuat