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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.
Meld FieldDescriptionMX Response Field
achACH data object
   accountNumberThe account numberaccount_number
   routingNumberThe account routing number. Reference Routing numberrouting_number
eftEFT data object
   accountNumberThe account numberaccount_number
   institutionNumberThe account institution numberinstitution_number
   branchNumberThe institution branch numbertransit_number
internationalInternational data object
   ibanThe International Bank Account Number (IBAN) for the financial accountNone
   bicThe Bank Identifier Code (BIC) for the financial accountNone
bacsThe BACS data object
   accountNumberBACS account numberNone
   sortCodeBACS sort codeNone