Well my tip would be, always make them pay you via friends and family.
They would try to get around it by saying their country only has g&s type payment, do not give in. Tell them you don't want to deal with them. It's better you not make any money rather than lose money.
With crypto, if you are receiving it, always wait for atleast 1 confirmation if the payment is below 100$ and I'd suggest to wait for 2-3 if it's above 100$ or a very large amount to prevent double spending.