Is it possible to integrate the SAML2.0 to authenticate the FileMaker pro?
What are you trying to authenticate with?
If you do some searches, you will find libraries that work with multiple languages for SAML2.0. You could connect to those via a micro-service you write.
In short: no. As fmpdude mentions you can use a go-between micro-service that serves as the endpoint where the SAML assertion gets sent to and from there you can talk to FMS and FMP.
BUT it won't be true OAuth2 / SAML-based authentication: that last step to talk to FMS/FMP will be through either a regular FM account or one of the supported FMS external authentication options.
So while the whole end-to-end can be made to work from a technical point of view, you have to be extremely careful not to open any security holes, *AND* you have to completely transparent to your custom on how exactly it works. I cannot be sold as OAuth2 / SAML authentication to FM, you'd fail miserably in any security audit.
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