Follow below steps to upgrade/change plan for any user/customer (Only for ESP Customers)
1. First of all login to AMS and Browse user which you want to upgrade. Now click on "User Payments/Subscriptions" and update the new plan and save. (Skip this step if user made payment, new plan will be automatically updated in AMS)
2. Now login to AEM as admin and goto "Settings>Users" click on the user you want to upgrade.
On Users Tab you will see option to update user group and login source id.
3. Change the User Group same to which you updated for this user in AMS.
4. Now you will need to update the Login Source Id. For this kindly click on Login Sources Tab there you will find the login source id copy it and put in "Login Source Id" field.
5. Click on Update button. That's it. Your user is upgraded to new plan.