Beware of such fraud and scam operations.
For example, let's say I am a fraudulent seller and you want to buy through the P2P feature.
You come to me and request a certain amount you wish to purchase; at the same moment, I go to another real seller on the same feature and request to buy from him the same amount you requested from me.
When the seller sends me his account details, I share them with you, and thus you end up paying the real seller's account details. Once the payment is confirmed with the real seller, he will send the funds to me because I initiated the conversation with him and I activated the purchase request.
Thus, the third party benefits from the payment, I benefit from the transfer, and you become a victim of a scam operation. Therefore, be cautious when wanting to purchase through this feature; check the comments section for this seller, see the responses from people who have dealt with him, the number of likes, the percentage of completed orders, all these factors enhance your protection from such operations.