For Payment Facilitators, the SubMerchantData block is required in each transaction request.  This data block provides the details about the Sub-Merchant processing location.  This data passes through to the card issuer to ensure that the cardholder can identify the merchant on their statement.  This information includes:

• Sub-merchant DBA name
• Payment Facilitator account and terminal ID reference IDs for the Sub-Merchant
• MCC for the Sub-Merchant processing location

See the SubMerchantData Complex Type in the Portico Schema.