Authenticate using Client ID and Client Secret

Use client credentials to authenticate with the Avalara 1099 & W-9 API. Create your client ID and client secret, then request a bearer token.

Step 1: Create API credentials in Avalara 1099 & W-9 web application

Note

Before you create API credentials in Avalara 1099 & W-9, enter a valid company address in the Accounts Settings > Account tab, and enable two-factor authentication in the Accounts Settings > Security tab.

Select Account Settings in the top-right corner, then select API.
Select Create new credentials.
Note
- Authenticate using your 2FA security key to enable this option.
- A new Client ID and Client Secret are generated.
Copy and store the credentials securely. These credentials are not visible again after you leave the screen.

Step 2: Request a bearer token

Make a POST request to the Avalara Identity service using the client_credentials grant type:

curl -X POST 'https://identity.avalara.com/connect/token' \
   --header 'Content-Type: application/x-www-form-urlencoded' \
   --data-urlencode 'grant_type=client_credentials' \
   --data-urlencode 'client_id={{client_id}}' \
   --data-urlencode 'client_secret={{client_secret}}'

This command sends a POST request to the Avalara Identity service. It specifies the headers and data needed to authenticate and retrieve an access token. Replace {{client_id}} and {{client_secret}} with your actual credentials.

Use the resulting bearer token to authenticate your API requests to the Avalara 1099 APIs.