I think the best way about this IMO is similar to albumoftheyear.org - they have different donation tiers you can choose from, and all of them get you a badge to indicate you’re a supporter. I think having say a minimum donation amount (whatever makes sense for you) that can be increased if someone chooses would be a good option, and you get a badge on your profile to show you’ve donated. Personally, I’m somewhat against the idea of putting features behind a paywall of sorts and also making verification paid for like what Twitter and Meta are doing, but that’s my personal thoughts.