Beware from Paxful Scams

What you said here is nothing new.
Everywhere when money is involved it will appear chargeback and refunds, sometimes the claim is real sometimes not.
If you follow their rules and in case if you are using their services according to their TOS, you are safe because it will not be a problem for you to send them screenshots with conversation ... the problem appear if you are doing something against their TOS, than you can not send them any screenshot :-)