B&D roll-a-pro smart relay connection

Hi, i have a b&d roll-a-pro garage opener and want to connect a smart relay to it so that i can control it via an app. Cant seem to find this particular board and related woring information. Pic attached. Can you please help which pins to use to connect the external relay or switch? Thanks

OSC stands for Open Stop Close. That’s where you want to connect as well as 0V.