Code Oauth into existing PHP script

Hi there, I currently use the asset management system (GLPI) [login to view URL] As part of the software you can use third party authentication methods like LDAP and Mail Accounts to login to the script. However for my needs I require the ability to authenticate between either of these 3 different options: Option 1 - Microsoft Account Option 2 - Google account or Option 3 - A third party system login My company uses both Microsoft and Google enterprise accounts where users can sign in with their @[login to view URL] address on these sites: [login to view URL] [login to view URL] They type their email address ([login to view URL]@[login to view URL])/password and are then redirected to my companys own SAML SSO login page. They then enter their credentials and if they are correct they are then redirected back to their google/microsoft account. What I am wanting is for the same sort of process to happen however have GLPI confirm they are logging in successfully through either of the options I listed above then redirect back to GLPI instead. GLPI natively supports the creation of accounts so this would need to happen however I am unsure how the password situation works as I would prefer the user to be authenticated against either of those options instead of creating a local database of users/passwords. I am unsure if this can be done and would be happy to discuss this further with a professional. Thanks. TJ