Hello,
In order to better understand your issue we will need to experience it by ourselves, for this can you provide these elements :
1. Administrator access link (backend url)
2. User backend references (with maximum ACL)
3. Paypal Sandbox references (to be able to simulate a complete order process)
Note : As, of course these references must be kept secret, you have to use our
Contact us
form to provide these, and don't forget to add an Url link to this topic in your message.
Awaiting your elements to progress on your subject
Regards