> ## Documentation Index
> Fetch the complete documentation index at: https://docs.meld.io/llms.txt
> Use this file to discover all available pages before exploring further.

# MX Identifiers Mapping

This data comes from MX's [/users/`{user_guid}`/members/`{member_guid}`/account\_numbers](https://docs.mx.com/api#verification_mx_widgets_list_account_numbers_by_account) endpoint and is returned from Meld's [/bank-linking/accounts](/api-reference/bank-linking/accounts/bank-linking-accounts-search) endpoint.

<Note>
  Example: MX `account_number: "1111222233330000"` and `routing_number: "011401533"` map to Meld `ach.accountNumber` and `ach.routingNumber` respectively.
</Note>

<Warning>
  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.
</Warning>

| Meld Field           | Description                                                                                          | MX Response Field   |
| :------------------- | :--------------------------------------------------------------------------------------------------- | :------------------ |
| ach                  | ACH data object                                                                                      |                     |
|    accountNumber     | The account number                                                                                   | account\_number     |
|    routingNumber     | The account routing number. Reference [Routing number](https://en.wikipedia.org/wiki/Routing_number) | routing\_number     |
| eft                  | EFT data object                                                                                      |                     |
|    accountNumber     | The account number                                                                                   | account\_number     |
|    institutionNumber | The account institution number                                                                       | institution\_number |
|    branchNumber      | The institution branch number                                                                        | transit\_number     |
| international        | International data object                                                                            |                     |
|    iban              | The International Bank Account Number (IBAN) for the financial account                               | *None*              |
|    bic               | The Bank Identifier Code (BIC) for the financial account                                             | *None*              |
| bacs                 | The BACS data object                                                                                 |                     |
|    accountNumber     | BACS account number                                                                                  | *None*              |
|    sortCode          | BACS sort code                                                                                       | *None*              |