# What authentication method does the Avalara 1099 & W-9 API use?

Source: https://developer.avalara.com/products/avalara-1099-and-w9/integration-guides/1099-and-w-9/vly2542886249530/

Guide: 1099 & W-9

# What authentication method does the Avalara 1099 & W-9 API use?

Learn about the authentication method used by the Avalara 1099 & W-9 API.

The Avalara 1099 & W-9 API uses OAuth 2.0 Bearer Token Authentication. You authenticate by generating a bearer token using your Account ID and License Key. Then include that token in the `Authorization` header of your API requests.