As you may have notice there’s a tons of text that represent the template you are supposed to fill 
• If you have just purchased Unlocker via the In-App option, it can take a couple of hours to be available on all your devices. This is due to how Google replicate and validate the licenses over multiple devices. Just wait a little time. If you go to the buy screen and validate that it says already purchased then reboot the device.
Note - No solution did work, or you do not understand some points
Be sure to have properly read and applied all the points of the FAQ (multiple times if unsure), then please contact me for help with:
• Your Order Number (listed at Google Payments ) or your trial ID and Ko-fi user name if you used that method.
• Logs (Debug logs). To have more details when gathering logs, please click on the purchase Unlocker again to get the error message or the restore license!
• Your details or questions about each of the FAQ points.
Support will not be able to help without all those information.