I can not find on your diagram what is PRG1. What does that stand for? Where is it on the receiver?
Also, Ideally, what amperage should the power adapter be? 2A? Will 1.5A work? There are no specifications for amperage on your specifications. It just shows “9V-30V DC”.
Third: Once you develop a code to open/close garage door, will that code work indefinitely? Meaning you will not have to program again?