Transaction identification and recognition

A method of providing receipts for contactless payment card transactions between a customer and a merchant, comprising:

• a customer using a mobile payment device which is, or emulates, a contactless payment card to conduct a contactless payment card transaction with a merchant device, wherein there are determined from the contactless payment card transaction a plurality of transaction-specific elements and a plurality of transaction identifiers are formed each from a separate transaction-specific element, and at least one of the plurality of transaction identifiers is received or generated in a transaction processing system wherein the transaction processing system provides transaction data associated with said at least one of the plurality of transaction identifiers, wherein each of the plurality of transaction identifiers is used by the transaction processing system to form a composite transaction identifier comprising a plurality of transaction identifier elements;
• and
• the customer matches transaction data with a transaction receipt through a process in which each transaction identifier is matched against each transaction identifier element to identify the transaction and to associate the transaction data with a transaction receipt;
• whereby the merchant provides receipt information and the plurality of transaction identifiers to a receipt service which provides the transaction receipt, and wherein the composite transaction identifier is used to obtain the receipt for the transaction from the receipt service.

A receipt service for providing a transaction receipt to a user, the receipt service being adapted to:

• receive receipt information for and a plurality of transaction identifiers from a terminal, wherein the receipt information and the plurality of transaction identifiers relate to a transaction between a payment token of the user and a terminal, wherein each of the plurality of transaction identifiers is derived from a transaction-specific element determined from the transaction;
• prepare a transaction receipt associated with the plurality of transaction identifiers;
• and
• provide the transaction receipt to the user on determining that one of the transaction identifiers has been provided.