Prestashop module for bookstore

I own a used book store. I am currently a brick and mortar store with a website. I give customers "trade in credit" for their used books and they can use that trade in credit to purchase books in my store for up to 50% off my sticker price. For example someone has $50 of trade in credit and wants to purchase a $2 book in my shop. We take $1 off their trade in credit and they pay $1 for the book. Then their available trade in credit would drop to $49. If that same customer would then purchase $150 in books they would only receive a $49 discount as that is all that in their trade in credit account. There are certain skus that trade in credit cannot be used so I would need to have an exclusion list as well for these skus. I would need an area that i could adjust the individual's trade in credit amount as every customer has a different trade in credit amount and it changes when they bring in more books. I am currently using prestashop 1.6 but I am going to be upgrading to 1.7 in the next few months. I would like the module compatible with both versions.

Prestashop Programlama

Proje NO: #16996672

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