How do merchants compensate consumers by putting praise cards?

How much consumers can claim depends on the actual situation.

If it causes personal injury to consumers, it shall compensate for medical expenses, nursing expenses, transportation expenses and other reasonable expenses for treatment and rehabilitation; Causing property losses, it shall compensate for the losses; In case of fraud, consumers can demand compensation of three times the loss, and under special circumstances, they can also demand punitive damages of less than two times.

Legal basis:

Law of the People's Republic of China on Protection of Consumer Rights and Interests

Article 49 Where a business operator provides commodities or services, causing personal injury to consumers or other victims, it shall compensate reasonable expenses for treatment and rehabilitation such as medical expenses, nursing expenses and transportation expenses, as well as reduced income due to absenteeism. If it causes disability, it shall also compensate the disabled for living AIDS and disability compensation. If death is caused, funeral expenses and death compensation shall also be paid.

Article 52 Where a business operator provides goods or services, causing damage to consumers' property, it shall bear civil liabilities such as repairing, redoing, replacing, returning goods, making up the quantity of goods, returning the payment for goods and services or compensating for losses in accordance with the law or the agreement of the parties.