# Visa Account Updater

## Authentication

### Security and Authentication Requirements

Visa Account Updater (VAU) APIs use the standard Visa Developer Center (VDC) project authentication.

Test credentials for sandbox testing can be obtained online in the Developer Dashboard for the project. Production credentials will be issued as part of the production on-boarding process. Contact [developer@visa.com](mailto:developer@visa.com) for more information or to begin the production on-boarding process.

#### Two-Way SSL

As one of the security protocols, Visa Developer sandbox secures its connections with clients by means of Two-Way SSL (Mutual Authentication) method. Refer to the link below to quickly learn about how to get credentials to start building with Two-Way SSL.

Visit the [Two-way SSL Guide](https://developer.visa.com/pages/working-with-visa-apis/two-way-ssl) to learn more.