Always report these calls for for reimbursement to Money Application, especially if they come from outside of the app. In no way return cash or go over “transaction costs” for strangers. If you are doing really need to refund anyone, use the “refund” functionality from within the application. Accepting bitcoin: https://bookmarkingdelta.com/story18344253/helping-the-others-realize-the-advantages-of-copyright-id-with-bitcoin