- For example, you can use a tool such as [Postman](https://www.getpostman.com/) to send the HTTP POST. If you [enabled Azure Active Directory Open Authentication](../logic-apps/logic-apps-securing-a-logic-app.md#enable-oauths) (Azure AD OAuth) for authorizing inbound calls to the Request trigger, either call the trigger by using a [Shared Access Signature (SAS) URL](../logic-apps/logic-apps-securing-a-logic-app.md#sas) or by using an authentication token, but you can't use both. The authentication token must specify the `Bearer` type in the authorization header. For more information, see [Secure access and data in Azure Logic Apps - Access to request-based-triggers](../logic-apps/logic-apps-securing-a-logic-app.md#secure-triggers).
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