UDP IAP not working

Hello,

I would like to try setup IAP
I am using unity editor 2020.1. Installed UDP, IAP and configured IAP target to UDP. I synchronized the project with the UDP portal
the code works in the editor in case of purchase completed or failure, however after installing the APK on my android device and successfully logging to UDP, the button doesn’t produce anything, what can be the reasons for this please ?

Thanks a lot in advance for your help

After the purchase is completed, UDP will not pop up a window like IAP, you should check the device log to confirm whether the purchase is complete.