NFT contracts that extend the ERC1155 and ERC721 standards (solmate implementations) allowing NFT minters to pay a premium on mint to get a refund window
See the contracts in the example folder for an example of how to create the returnable receipt on a mint or refer to the test file to see how to mint with receipt and issue refund.
To set your own premium for returns override the returnPrice function with your own formula.
This is an unaudited concept and not production ready, use at your own risk