Connecting your service to SURFconext consists of a contractual and a technical part that can be executed in parallel. The exact procedure depends on whether you are a commercial vendor or an institution (a member of the SURFnet community).
If you are new to SURFconext and only need a global overview of SURFconext you might want to read this page. You can also view a webinar to connecting an SP to SURFconext on the Coöperatie SURF Youtube Channel.
If you are a software engineer and you need to know more about SAML, OpenID Connect, etc, you probably want to read our technical part. Just don't forget there is a contractual part!