I think we need to wait until seeing the site working to judge technical matters, but there are some questions:
- Guarantee Cards: How can we ensure that these cards are from reliable sources and not stolen, hacked or reused?
- Discount: you talked about a 30% discount but did not specify the exact level, as there are a lot of competitors such as
https://purse.io, which provides discounts and reliability.
- Escrow: How can third parties ensure that you are selling valid codes and that plaintiffs can prove that the code you sent them is not working?
I've updated the original post with some more details and hopefully answering some of the questions you've listed!
In terms of discount, it will be a fixed ratio based on the price of the card. Smaller valued cards will have lower discounts while larger value cards will have higher discounts. The exact discounts themselves is floating, and adjusted based on supply and demand from consumers and brokers.