Connecting the garage door with right cable and can be tricky since there are no manual for your specific Garage door opener. Luckily at https://gates.gogogate.com/gates.php there is a garage compatibility lookup tool.
I simply entered my Hormann ProMatic 3 and I got a easy to understand wiring diagram
Lucky me. If I did not have this there is no way I would find this out by myself. This configurator should be showcased on the front page in my opinion.
The rest was easy, I simply put the cables in and there, done! used the adhesive pad to stick the sensor underneath the opener. Not very beautiful but, it is only a garage 🙂
Don’t forget that you need to place the door open/closed sensor on the garage door itself. IMPORTANT that you place the sensor on the middle of the door. Some doors tend to be tilted and the sensor might give off a wrong reading if it is on the top.