To check the membership upgrades history, please enter the start and end date, the username and click search.

Start Date: The start time of an user's membership upgrades.
End Date: The end time of an user's membership upgrades.
Username: The username of whom upgraded his/her membership.

Sample search results:

Click Detail to view the user's upgrades history, including Created Time, Duration (Days), Sender, Receiver, Level and Credits.

Created Time: The date of an upgrade.
Duration (Days): The upgrade duration.
Sender: The username of whom paid for the upgrade.
Receiver: The username of whom was upgraded.
Level: The upgrade membership level, VIP, Premium or Plus.
Credits: The credits amount spent for the upgrade.

Related links:
Upgrade Membership