I wouldn't rely on a payment screenshot alone because fake notifications can look very convincing. I'd ask for the transaction reference number and check whether the details match the payment record, but I'd still verify the money directly through my own account or payment app before completing the transaction. A reference number alone isn't proof, since scammers can reuse details from someone else's transaction. If the buyer refuses to cooperate or something doesn't add up, I'd be cautious. For in-person transactions, I'd also make sure the payment is confirmed before handing over the item, rather than trusting a screenshot or notification.