Ladies and gentlemen, do you know how to control the security of gift cards?

Shanghai Yidian has a professional gift card management system. At present, the main security control points in the gift card system of Wing Code are: one application and one review, including document preparation, warehousing, allocation and sales; The documents delivered to the printing factory are encrypted with public and private keys and digitally signed to ensure data security and non-repudiation; The general printing method is clear text voucher number+override password, and only the voucher number is used for subsequent transfer sales, and only the override password is used for write-off; After the printed paper coupons enter the general warehouse, they are inactive before actual sales and cannot be written off. Even if the coupon in this state is lost, there will be no loss. Only the coupons registered for sale will be activated and cancelled.