Hello! You are required to provide your transaction order, payment voucher, and relevant evidence that you think has been infringed. For example, if you think there is a quality problem, you need to provide an unqualified report from the quality inspection agency; if the shipment is delayed, then You need to submit the time you placed the order, the record of the other party's promised delivery time, etc. That is to say, it depends on what your demands are. Of course, one thing that needs to be made clear is that most of the evidence generated during our online shopping process is electronic data. It is recommended that after clarifying your appeal, you should notarize the corresponding evidence through a notary office. If you agree with this answer, please click "Accept"