'How to attach price to NFT mint?

I am having a little trouble with attaching a price to my NFT contract. After deploying, I am testing by sending the contract the amount, but it does not look like the contract is saving/retaining the sent amount because the contract balance stays at 0.

Is there some keyword that I need for the contract to accept/take the .value from the transaction? The relevant part of my mint function is here:

// reconcile payments

bool sent = payable(owner()).send(tokenPrice);

require(sent, "failed to send ether");

if (msg.value - tokenPrice > 0) {

payable(msg.sender).transfer(msg.value - tokenPrice);

}

Also, I am having trouble adding a price to the transaction from the website. Is this something that should be done on the client side with ethers.js?

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'How to attach price to NFT mint?

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