If there is a cooperative relationship, the repair shop will hand over the relevant claim materials to the insurance company, and the insurance company will call the repair shop to get the money.
Without cooperation, this maintenance insurance company can only call the insured.
The writing of the power of attorney for claims is very simple, and the format of each insurance company is different.
The basic contents are the time and place of the accident, the policy number, the report number, the account number authorized to the repair shop, and finally the signature.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.