If the company account number changes, the payer needs to prove how to open it.

A company: the bank settlement account of our company is changed as follows: original account name: original account number of a company: XXXXX, original bank: XXX bank changed to: account name: new account number of a company: XXXXX, new bank: XXX bank hereby declares that your company's funds shall be subject to the new account. Thank you for your cooperation! A company (official seal) year month day.