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This data comes from MX’s /users/{user_guid}/members/{member_guid}/account_numbers endpoint and is returned from Meld’s /bank-linking/accounts endpoint.
Example: MX account_number: "1111222233330000" and routing_number: "011401533" map to Meld ach.accountNumber and ach.routingNumber respectively.
MX does not return international identifiers (IBAN, BIC) or BACS (UK) account details. Those fields will be null in the Meld response when sourced from MX.