What are the rules for CashBack in France?

Cash back, or cash withdrawal on purchase, is a method that allows you to withdraw money in cash during a credit card transaction at a merchant. For example, if you buy a product for €20, you can pay €60 by card and get €40 in cash from the seller. This service has existed for several years in several countries, such as the United Kingdom, Germany, or Sweden, and is used by several large retailers in France.