Connect to CRM 2016 with ADFS authentication

I need to authenticate  to a CRM 2016 in order to use their API for data synchronization project written in php but the CRM are protected using ADFS so when I try to access the CRM app I got the following link https://adfs.crm.org.com/adfs/ls/?wa=wsignin1.0&wtrealm=https://internal.crm.org.com:5443/&wctx=rm=1&id=4d65271b-682e-44bb-80ce-ed44b5370ed7&ru=%2forgTechnicalTraining%2fdefault.aspx&wct=2016-11-02T07:15:47Z&wauth=urn:federation:authentication:windows which is a ws-federation protocol, then a window is shown to authenticate using username, and password. 

I need to authenticate my application without user existence. I read that ws-trust are suitable for my scenario.

Any help appreciated I'm struggling with this task.