JWT and other APIs

I am wondering if i can get direction on how to access other APIs after setting up JWT.

My sites api url is

https://sub.mysite.com/wp-json/wp/v2/users

This is an example api for Paid Membership Pro

https://example.com/wp-json/pmpro/v1/change_membership_level?user_id=1&level_id=3

I have tried
https://sub.mysite.com/wp-json/wp/pmpro/v1/change_membership_level?user_id=1&level_id=3
https://sub.mysite.com/wp-json/wp/v2/pmpro/v1/change_membership_level?user_id=1&level_id=3
https://sub.mysite.com/wp-json/pmpro/v1/change_membership_level?user_id=1&level_id=3

All return

{
    "code": "rest_no_route",
    "message": "No route was found matching the URL and request method.",
    "data": {
        "status": 404
    }
}

Please let me know what the correct url would be.