I wouldn't suggest anyone to develop SAML support on their own unless they want to sell that as a component or service by itself. Instead, I'd strongly recommen

I wouldn't suggest anyone to develop SAML support on their own unless they want to sell that as a component or service by itself. Instead, I'd strongly recommend that they look for libraries that have been around for sometime that take the grunt work out and provide high level APIs for the application to invoke. With this approach, supporting SAML becomes a whole lot easier and quicker to accomplish. One may have to pay real money though, depending on the platform, framework and language. Free ones in this area, to the extent of my research, come up short on reliability. Also, the most common use cases are related to browsers, and don't need the entire specification of SAML to be implemented, like all the profiles, for example.