Digital discount cards solution to my website

I want to sell digital discount cards to clients. Those digital cards will be used by clients when they visit an affiliated venue to have discounts. Clients scan a qr code provided by my on flyers, banners, etc. That QR Code redirects the client to my website (to the page where they could buy the discount card). Once the QR code is scanned client arrives to the landing page, where they can see the available discounts and have the banner to click and start process of purchasing the digital discount card. Until here is done by me. When Client click to the order link, he arrives to another page where start ordering process. From here I need the Freelancer. Clients must have to register, and select the starting and Ending day of the discounts. That is because, depending on the days the cost of the purchase will vary. The same happens with the number of people. Once everything selected, Total amount will appear. Buying process order continues as usual. Then clients make the payment with Pay Pal. After the purchase is done. Clients receive by email or downloaded something like in the picture, where: It must appear my logo and phone link for assistance. It must appear the name and last name of the client. It must appear an order number It must appear the expiration date (which is the same than the ending date seen on step 3) It must appear a QR code that venues can scan and access to the information to see if the digital discount card is still available or not. I don't know which format clients have to receive this. And if possible I thought that could be interesting to add 2 banners at the bottom, one which will link to buy another digital discount card and another to link to the offers they can enjoy (that would be my website page seen on step 2) Considerations: My website is buided with Joomla The clients register should be saved to database I would need a backend to manage the sales and clients As I am going to have different sellers I want to have and ID or something that differenciates the sellers in order to know where the sales came from and know how many sales did every salesman in order to pay sales commissions. So I need to have the posibility to add sellers to the backend. More ideas may be listened.