Merchant ID Registration {#tms-mid-reg}
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A `Visa Acceptance Solutions` MID is a unique value within `Visa Acceptance Solutions` that you define during account registration. Your MID identifies your merchant account and payment configuration within `Visa Acceptance Solutions` systems. You provide this identifier when you sign in to the `Business Center` and submit transactions to `Visa Acceptance Solutions`.  
Multiple MIDs can be configured for various token types. You receive the instrument identifier token regardless of your account's token type. Reasons for multiple MIDs include:

* You have multiple processors.
* Point-of-sale terminals have unique MIDs, which are usually configured for the PAN-only instrument identifier token.
  {#tms-mid-reg_ul_vhc_rc5_qwb}  
  When you have multiple MIDs, you can set up one token vault to which all of your MIDs have access or set up multiple vaults to limit access to tokens. See [Token Vault Management](/docs/vas/en-us/tms/developer/all/rest/tms/tms-onboarding/tms-vault-hierarchy.md "") for more information on setting up and managing your token vault.

Create an Evaluation Account
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To create an evaluation account, visit the [`Business Center` Evaluation Account Sign-Up](https://developer.visaacceptance.com/hello-world/sandbox.md "") page.  
To complete the registration process, follow the email instructions that you received to activate your merchant account, and log in to the `Business Center`.  
Send your merchantID to `TMS` representative supporting you with integration to create a vault and enable `Token Management Service` with network tokens.