I was approached directly on WhatsApp for a sale published on olx ( a sales site). The person tried to obtain from me my bank account details saying that she made a payment to me through olx for the product I was selling. In this regard, she sent me a link by sms, a different link from that used by the official site olx. She tried to convince me that is a secure way of selling and receiving money for the product, but I confronted her and stopped answering.
The olx site offers information about such cases of phishing and that is why I recognised this fraud.