If bitcoin passes, someone is paying me with bitcoin

To make sure you don’t fall into scams (also known as the payment will be returned), we recommend following the steps below.

1. Once you broadcast a transaction that you pay you, Ask him or her for the transaction ID. It’s a rather long chain of Alphanum-shaped characters. example: 175A9BFFC0E84A7507C94AB8C28ADE40E629F051BD14F7F5FD4C2B0A0E9824A4 (This is the Coinbase transaction at block 910025).
2. Go to Block Explorermempool.space etc. Find the transaction ID That a customer sent you.
3. Please check the number of confirmations of the above transaction. As a standard, If a transaction gets 6 or more confirmations, it is considered final So, it is actually irreversible and not fraudulent.

If you have doubts, I hope this helps.