This is some bullshit from Coinify for sure!
OP, if you want a temporary residential proxy for paying, I resell some residentials, so I can get you one that works for a couple hours for only a small fee (like $5 or something, I still haven't decided). For sure these will not be detected as VPNs, since they are not datacenter IP addresses.
Asking someone to open the payment link and give me the address would be easier, but I don't want to do that (every year again). CoinPayments or self hosted FTW
