According to the accounting school, taxpayers can issue special invoices for value-added tax under other circumstances except that the buyer belongs to other individuals. When the gym handles the invoice of fitness card, it should be coded in detail, and the fitness card can be written directly. So you can ask for it directly from the store.
According to the laws and regulations on invoice management and tax collection, such as Article 22 of the Law on the Protection of Consumers' Rights and Interests and Article 19 of the Measures for the Administration of Invoices, operators are obliged to issue invoices for consumers, regardless of whether discounts are adopted. Discounting is the business behavior of the operator, and it cannot be used as an excuse not to invoice, otherwise it is suspected of tax evasion and should be punished accordingly.