I've got an ERC1155 contract and I want it to receive an ERC721 token and give other tokens in exchange for that. Can I somehow add ERC721 Receiver interface?
Can you make an ERC1155 contract receive an ERC721 token?
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Yes you can do that. It would be best to start looking here at OpenZeppelins documentation on it: https://docs.openzeppelin.com/contracts/2.x/api/token/erc721#IERC721Receiver
In your method that accepts ERC721 tokens, you will need to make sure that the sender approves your contract to transfer tokens on their behalf or else the transaction will fail.
In conjunction with
IERC721Receiveryou have to use thesafeTransferFrommethod for this to work properly.hope this helps.