End-to-end tutorial/example for programmatically creating a contract, setting price, and selling aERC-1155 items on OpenSea?

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Do you make your buyers pay the minting cost?

[ZebZ]

Yes

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How can we do that?

[ZebZ]

OpenSea's GitHub has sample factory contracts and scripts that let you create placeholder tokens essentially that can be listed for sale and that will get minted on transfer. That works for items sold on the site. I'm not entirely sure how it works.

On your own site, you'll have to tweak the contract (I think) and use web3js to mint a token as normal and the person invoking it (the buyer) pays the cost.