Be suspicious of prospective buyers and the proof notifications they send using online services. Scammers carry out fraudulent transactions by sending payment proofs money transfer number as evidence. But such malicious spams are not reliable and should not be considered as genuine proofs.
One must authenticate the intended recipient by personally verifying and checking if the amount is actually credited in your account. Avoid domestic and inter-state money orders. Always try accepting payments through reliable ways and means.
Avoid taking immediate and hasty decisions when buyers offer some kind of interesting deals that may indeed result in heavy losses.