The most likely reason this happens is when Payments2Us was first installed from the AppExchange, the option to install for all users was selected. Options are:
- If you have just installed the App and have not completed any configuration, then uninstall Payments2Us (make sure sure you untick the remember 48hours memory checkbox)
- OR go through each profile and restrict access to the Payments2Us, all Payments2Us Tabs/Objects and Object fields.
Further and more detailed help is not part of our standard support