2. Consult the platform customer service: contact the platform customer service to inquire about the refund regulations in detail, including the refund application process and the refund method of the refund amount.
3. Refer to other users' experiences and comments: Find other users' comments and share, and understand their experiences and feelings in the refund.
4. Authority certification: Understand whether the platform has relevant authority certification, such as the approval of the education department or the security platform certification.