Is it possible to create certificate-based authentication for a Web API? The pur

Based on the docs It should be possible since Web APIs use the same Authentication as the rest of Appian
forum.appian.com/.../Web_APIs.html

and Appian does support certificate based authentication
forum.appian.com/.../Authentication.html

However If the requirement is to have separate authentication mechanisms for Appian and Web APIs then it may not be supported.

Thanks Abhi - I haven't worked with Web APIs in the past but based on the documentation, it looks like I'd have to use a HTTP basic authentication to invoke the Appian Web API from another system. In this case, the external system would use the 'GET HTTP' method to retrieve data using the Web API but I'm not sure to set up the authentication scheme for that.

Web APIs will work with any Appian supported authentication mechanism. In order to get certificate based authentication to work, you need to set up an identity provider (external to Appian), and then configure Appian to use SAML to connect to that identity provider. Appian will then forward certificate based authentication requests to an external identity provider that will process the certificate.

HTTP Basic Authentication is a username / password based authentication mechanism. Most tools that support REST have it built in, and you should be able to find the protocol specifics by looking through their documentation. The basic idea is that the http client sends a special header with it's HTTP requests that encodes the user name and password in a specific format.

Thanks #andrewg! That helps a lot!