Recurring Payments with Google Pay

When you submit the first transaction in a recurring/installment stream, or when storing credentials for future purchases, you must set the <processingType> element to either initialRecurring, initialInstallment, or initialCOF (Card on File), as applicable. With the exception of an American Express transaction, the XML response message includes the <networkTransactionId> element. You must retain the value returned for use in future transactions. When you submit the next and all subsequent transactions in the recurring/installment stream, set the <orderSource> to recurring or installment as appropriate, and include the networkTransactionId value in the <originalNetworkTransactionId> element. For a CoF transaction, set the <orderSource> to ecommerce and the <processingType> element to either merchantInitiatedCOF, or cardholderInitiatedCOF (Card on File), as applicable (see Card on File Processing).