(1) The payment service provider may only charge the payment service user for the fulfilment of any of its obligations under this Part -

(a) in accordance with regulation 82(3) (refusal of payment orders), 83(6) (revocation of a payment order) or 90(2)(b) (incorrect unique identifiers);

(b) where agreed between the parties; and

(c) where such charges reasonably correspond to the payment service provider's actual costs.

(2) Where both the payer's and the payee's payment service providers, or the only payment service provider, in respect of a payment transaction are within the United Kingdom, the respective payment service providers must ensure that -

(a) the payee pays any charges levied by the payee's payment service provider; and

(b) the payer pays any charges levied by the payer's payment service provider.