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dapp-sample-lucid-if-token-paid.md

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If Token Paid Minting Policy used from Dapp (sample)

Because there are so many different platforms for web applications, we simply provide sample off-chain javascript to interact with the smart contract instead of doing a complete dapp. The library we use in this example is the great lucid

To make this sample even more interesting, we are showing how to request an amount of stable coin Djed before accepting mints. Just think about the possibilities this gives you:) If you want to do the same on mainnet, make sure to provide the correct policy id for Djed stable coin, or any other stable coin or token.

async function payDjedToMint() {

  // connect to the wallet
  const lucid = await connectwallet();
  const utils = lucid.utils;

  // the smart contract and redeemer
  const unitRedeemer = () => Data.empty();
  const payDjedToMintScript = {
    type: "PlutusV1",
    script: "insert the plutus cbox hex here..."
  }
  
  // calculate policy id of minting policy and token to mint with that policy
  const mintingPolicyId = utils.mintingPolicyToId(payDjedToMintScript);
  const tokenToMint = mintingPolicyId + utf8ToHex("insert token name to mint"); // make sure the token name is allowed by the minting policy

  // provide information about the Djed **testnet** token accepted as payment
  const djedPolicyID = "9772ff715b691c0444f333ba1db93b055c0864bec48fff92d1f2a7fe"
  const djedTokenName = utf8ToHex("Djed_testMicroUSD");
  const djedToken   = djedPolicyID + djedTokenName; 

  // get payment pub key has of currently loaded wallet
  const bech32_addr = await lucid.wallet.address();
  const addrDetails = utils.getAddressDetails(bech32_addr);
  const paymentKeyHash = addrDetails.paymentCredential.hash; 
  
  // create transaction that mints the desired token and pays the required Djed per token minted
  const tx = await lucid
    .newTx()
    .payToAddress("addr...", {[djedToken]: 10000000n }) // 10 (testnet) Djed
    .mintAssets({[tokenToMint]: 1n }, unitRedeemer())
    .attachMintingPolicy(payDjedToMintScript)
    .addSignerKey(paymentKeyHash)
    .complete();

  // sign and submit transaction
  const signedTx = await tx.sign().complete();
  const txHash = await signedTx.submit();
  console.log(`transaction id ${txHash}`);  
}

For the above code to be successful, the payToAddress() must pay the required number of Djed to the address the contract is monitoring. The paying wallet will receive the minted token(s).