After checking you qualify it should have a link telling you to create an account ( payoneer, I’m in the US not sure about others). Filling out the forum for payoneer was a pain need bank info. I had to use chrome as Firefox would not load their forums properly. Also takes about a day for payoneer to confirm my account then if you filled our googles stuff payoneer just kinda knew and dropped the money in my account.

https://support.google.com/pixelphone/answer/16340779?hl=en

Just a reminder if you have a 6a you can get ~100$ or battery replacement. Its a bit of a hassle but not to hard to fill our claim. I for my 100$ ordered a 7 and installed Graphene OS.