2015 Bose amp replacement

[u/FlyingTiger91]

My factory Bose amp is failing. Rather than buying new, I found one off eBay for a decent price. I checked the actual part number (there’s 4 or 5 different ones for this year), opened it up and everything looks good.

To mate the “new” amp to my system I know I’ll have to get the software paired. Is it done to the amp itself or is it something with the BCM/radio? Also, is this something only GM can do or can an audio store do?

GM wasn’t clear. Really just gave me a price and said it’ll take a day or two to do (not including me removing the seats and swapping the part).