How to make minting function that takes 0.1 ethereum in Solidity? - token

Question

Can someone please explain how can I make a function that mints a token for 0.1 eth in Solidity and verify it in HardHat? I have done this so far:
HardHat:
[owner] = await ethers.getSigners();
const Nft = await ethers.getContractFactory("contract");
const nft = await Nft.deploy(owner.address);
prov = ethers.getDefaultProvider();
let balance = await prov.getBalance(owner.address);
console.log(balance); <-- evaluates to 10000000000000
await hoodie.mint({ value: ethers.utils.parseEther("0.1") });
console.log(balance); <-- still evaluates to 10000000000000
Solidity:
function mint() payable public returns (uint256) {;
require(msg.value == 0.1 ether || msg.value == 100000000000000000 wei, "Transaction amount has to be 0.1 eth");
_safeMint(msg.sender, token_id);
return token_id;
}
Thanks in advance!

Answer 1

in that case,
you may try adding approve and transferFrom methods.
approve is needed to make you approve the fund transfer
transferFrom is needed to make the fund transfer happen
the contract:
function mint() payable public returns (uint256) {
require(msg.value == 0.1 ether || msg.value == 100000000000000000
wei, "Transaction amount has to be 0.1 eth");
IERC20(*the ETH address here*).approve(msg.sender, msg.value);
IERC20(*the ETH address here*).transferFrom(msg.sender, address(this), msg.value);
_safeMint(msg.sender, token_id);
return token_id;
}

Answer 2

You need to use payable to transfer native token such as ETH or BNB in smart contract.
And then you can call _safeMint() private function with token ID.
You also need to increase token ID after mint.
function mint() payable public returns (uint256) {
require(msg.value == 0.1 ether || msg.value == 100000000000000000
wei, "Transaction amount has to be 0.1 eth");
payable(this).transfer(msg.value);
_safeMint(msg.sender, token_id);
token_id.increament();
return token_id;
}