[Length=3] This is the customer code, a unique customer ID allocated to a customer when the service is set up

[Length=12] This is the site identifier, a unique site ID allocated to a customer when the service is set up

[Length<=50] This is a username allocated to a service user when the service is set up; it refers to a service account not a person

This is a combination of how the card was captured and transaction type of the transaction. i.e. mailorder.sale, internet.preAuthorization. Refer to Type under Elements

This is the monetary value of the transaction in minor units. See Note1

[Length=3] This is the currency of the transaction. This is the currency code. A three character code in accordance with ISO 4217

[Length<=50] This is the merchant's own unique reference for the transaction

[Length<=50] Required for AliPay/Wechat/Klarna, this is the clientSystemTransactionId from the original transaction

[Length<=50] This is the merchant's external facing order number with the consumer, which if supported, will be passed to the Provider as an additional descriptor.