Validating an Account Using a TMS Token: Instrument Identifier {#visa-bank-acct-val-validate-reg-tms-instrument-ident-intro}
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An instrument identifier is a type of token created by Token Management Systems (TMS) to identify the bank or payment account to use for payment. It can be used to validate a customer's routing and bank account information.  
This section describes how to validate using an instrument identifier type of TMS token submitted through the REST API. Follow these steps to request a bank account validation:

1. Create a request with the required and any optional REST API fields. Refer to the request and response examples, if needed.
2. Send the completed request to one of these endpoints:
   * **Production:** `POST `<https://api.cybersource.com/bavs/v1/account-validations>
   * **Test:** `POST `<https://apitest.cybersource.com/bavs/v1/account-validations>
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3. Verify the response messages to make sure that the request succeeded. For more information, see the [Transaction response codes](https://developer.cybersource.com/api/reference/response-codes.md "").
   {#visa-bank-acct-val-validate-reg-tms-instrument-ident-intro_ol_b3w_2jw_52c}