post https://api.shift.io/v3/projects//invitation
This call is used to add users to a Project in Shift. Before making this call you need the follow:
- project id you want to add users to.
- email(s) of the user(s) you wish to add to the project
- role id(s) you want to assign to the users for this project. You can get them by making this call: Get Role Templates