The annual fee is paid according to the application date and must be paid before the application date. It has nothing to do with the authorization date.
You can pay it in advance, or you can find an agency to manage it, but a handling fee is usually charged.
If the application date is January, you will have to pay a late fee. If it is 6 months after the application date, you will have to pay a 1,000 yuan recovery fee.
If it exceeds 2 months, which is a total of 8 months, the patent will be terminated. It is recommended to pay the annual fee as soon as possible.