Use a Basic Authentication Credential when the external API expects a username and password in the standard HTTP Basic format.

Payloads takes the username and password from the Credential and generates an Authorization header for the outbound request. The Payload only needs to reference the Credential.

Confirm that the external API uses Basic Authentication and that the username and password are active for the API environment you are calling.

Basic Authentication is usually environment-specific. A sandbox username and password may not work against a production endpoint.

Create a Credential from the relevant Integration.

Set Type to Basic Authentication.

Enter the Username and Password supplied by the external system.

Save the Credential and review the Generated Headers section.

Payloads generates the Basic Authorization header from the username and password on the Credential.

Open the outbound Payload that should use the username and password.

Select the Credential in the Payload header fields, then save the Payload.

Keep the generated Authorization header on the Credential. Do not recreate it manually on the Payload's Headers tab.

Before testing, check that:

After a test run, open the Job record and check the response status. A 401 or 403 response usually means the username, password, endpoint environment, or account permissions need to be reviewed.