get https://try.count.ly/i/groups/save-user-group?api_key=api_key&args=args
Add user to a group or remove from current group
This endpoint can be used to add user to a group or remove from current group. Here are examples of args value for both operatipns:
// args value for adding user to a group
{"email":"USER_EMAIL","group_id":"GROUP_ID"}
// For removing user from current group, just omit group_id parameter
{"email":"USER_EMAIL"}