Outbound REST authentication Outbound REST messages support multiple types of authentication. Different web service providers may require a specific type of authentication. Outbound REST supports the following authentication formats. Basic authentication using a username and password OAuth 2.0 using an OAuth provider and profile Mutual authentication using protocol profiles Authentication requirements Outbound REST supports mutual authentication only when using basic authentication. Mutual authentication is not available with OAuth 2.0. OAuth 2.0 can be used only with messages that are not configured to use a MID Server. You cannot send OAuth 2.0 authenticated messages through a MID Server. When scripting new REST messages configured with authentication you must use the RESTMessageV2 API. The legacy RESTMessage APIs do not support current authentication formats. Configure a REST message with basic authYou can configure an outbound REST message to provide basic authentication credentials with each request.Configure a REST message with OAuthYou can configure an outbound REST message to send OAuth credentials with the request.Outbound REST mutual authenticationMutual authentication causes the web service provider and consumer to authenticate with each other before communicating.