Abstract: A voucher processor (122) receives (204) a plurality of voucher identifiers from a voucher provider (132) and, for each voucher identifier, instructs (208) the issuing of payment credentials of a payment instrument from an issuer processor (123). The issuer processor (123) or the voucher processor (122) links (210) each voucher identifier to payment credentials of a corresponding payment instrument. The voucher processor (122) or issuer processor (123) submits the plurality of voucher identifiers to the voucher provider (132) along with the linked payment credentials for each voucher identifier, such that, subsequent to a voucher being activated (408), the voucher provider is capable of initiating (424) a transfer of funds associated with the voucher in favour of the voucher provider (132) by transmitting the payment credentials linked to the voucher identifier for receipt by the issuer processor (123).