Transactions can be authorized, cleared, and settled either as dual-message transactions or as single-message transactions. The processing method may vary depending upon the payment method issuer, the type of card, or the region in which the transaction takes place.
- In a single-message transaction, the merchant submits a single electronic message containing all data required for the authorization, clearing, and settlement of the transaction. The initial transaction state is COMPLETION.
- In a dual-message transaction, at the time of purchase, the merchant submits an electronic message containing the information required for an authorization decision. At a later point in time, the merchant submits a second message containing additional data required for clearing and settlement. The initial transaction state is PENDING.