1. First, the title says "Power of Attorney for Purchase Invoice".

2. Secondly, write down the name, ID number, contact information and other information of the principal (i.e. himself) in the text. The client's name, ID number, contact information and other information. Entrust matters, entrustment period, that is, the start time and end time of entrustment. Rights and obligations of the client.

3. At the end, the signature and date of the client and the signature and date of the principal shall be stated.