For me. I tried it a few more extra times, but made sure not to be double charged.
After a few tries, it worked for me. If you still struggling, then i suggest you use something else! ;3

Yeah, the Boosty<->Paypal integration leaves a lot to be desired.

I think there's something wrong with how it stores the auth token or whatever from Paypal; for me, it works if I go into Boosty, delete the paypal as a payment method and re-add it. Then it'll work for a bit, then at some point I'll have to delete and re-add it, at which point it'll work again for a while.

I've gotten in the habit of deleting it and re-adding every time I go in to pay someone, haven't had those "infinite loading" problems since.

You may have to wait a few days and try it again. Sometimes the Boosty traffic is high enough to cause problems with payment.

it can be a bit wonky at times but generally works fine
maybe try a different browser and see if that works