How to integration user login data in the URL of the SharePoint site.
Reason: Our organization hopes the external user to visit Sharepoint site by one an internal account.
The external user already has our system's login data and we want to reduce the login step.
Login procedure like below:
1. User login in our system.
2. User clicks the link to SharePoint to visit the site and document. (the link have username and password of office365 internal user. )