The identifier associated with the card network's bulk enrollment feed.
For Amex, this field should contain the Recipient ID in the following format 'R{RecipientId}', such as 'R123456'.
For Mastercard, this field should contain the Delivery ID.
For Visa, this field should contain the RPIC in the following format 'RegionId_ProcessorId_IssuerId_CompanyId', such as '123_456_789_1'.
For more details on our bulk enrollment process, refer to this guide.