Question

You are designing a custom connector that a Power Automate cloud flow will use to call a third-party payroll REST API. The API requires each request to include an OAuth 2.0 access token issued by the vendor's Microsoft Entra ID tenant, and the vendor wants the connector to prompt each user to sign in with their own vendor account so that per-user audit logs are maintained. Which authentication type should you configure on the custom connector?

Accepted Answer

OAuth 2.0 with the generic provider, configured with the vendor's authorization and token URLs

Answer

API Key authentication, storing the vendor's shared secret in the connector definition

Answer

Basic authentication using a single service account username and password

Answer

No authentication, and pass a static bearer token in a custom header policy