# Overview
  * Overview
  * How to issue an invoice?
  * Invoice content and tax rate
  * How to add notes and request messages?
  * Delegation of third-party payment proof
  * What to do if the information is filled in incorrectly after the application is submitted?
  * What to do if the invoice is refused after the audit fails?
  * Procedures for changing the invoice title
  * UCloud invoice application management rules