the second question is:
filing form (that is, application form), power of attorney, and applicant's main body certificate
1. It is not necessary to submit the license filing contract when submitting the application, and it may be issued later to make corrections to request the license filing contract (usually less likely).
2. The license filing contract does not require notarization.
the third question: 1-63218422/63218423/63256488
the fourth question: both methods can be used, either by window or by mail.