Paiement avec mémo

// Click ">" icon on left to expand demo imports

// Generate keypairs for sender and recipient
const sender = (await generateKeypair()).signer;
const recipient = (await generateKeypair()).signer;

console.log("Sender Address:", sender.address);
console.log("Recipient Address:", recipient.address);

// Demo Setup: Create client, mint account, token accounts, and fund with initial tokens
const { client, mint } = await demoSetup(sender, recipient);

console.log("\nMint Address:", mint.address);

// Derive the Associated Token Accounts addresses (ATAs) for sender and recipient
const [senderAta] = await findAssociatedTokenPda({
  mint: mint.address,
  owner: sender.address,
  tokenProgram: TOKEN_2022_PROGRAM_ADDRESS
});

const [recipientAta] = await findAssociatedTokenPda({
  mint: mint.address,
  owner: recipient.address,
  tokenProgram: TOKEN_2022_PROGRAM_ADDRESS
});

console.log("Sender Token Account:", senderAta.toString());
console.log("Recipient Token Account:", recipientAta.toString());

// =============================================================================
// Token Payment with Memo Demo
// =============================================================================

// Create instruction to transfer tokens from sender to recipient
// Transferring 250,000 base units = 0.25 tokens (with 6 decimals)
const transferInstruction = getTransferInstruction({
  source: senderAta,
  destination: recipientAta,
  authority: sender.address,
  amount: 250_000n // 0.25 tokens
});

// Create instruction to add a memo to the transaction
const memoInstruction = getAddMemoInstruction({
  memo: "Payment for services rendered - Invoice #12345"
});

// Prepare and send transaction with both transfer and memo using @solana/client
const signature = await client.transaction.prepareAndSend({
  authority: sender,
  instructions: [transferInstruction, memoInstruction],
  version: 0
});

console.log("\n=== Token Payment with Memo Complete ===");
console.log("Transaction Signature:", signature.toString());

// Fetch final token account balances using @solana/client SPL token helper
const splToken = client.splToken({
  mint: mint.address,
  tokenProgram: "auto"
});

const senderBalance = await splToken.fetchBalance(sender.address);
const recipientBalance = await splToken.fetchBalance(recipient.address);

console.log("\nSender Token Account Balance:", senderBalance);
console.log("Recipient Token Account Balance:", recipientBalance);

// Fetch transaction details to view the memo in the logs
const transaction = await client.runtime.rpc
  .getTransaction(signature, {
    encoding: "jsonParsed",
    maxSupportedTransactionVersion: 0
  })
  .send();

console.log("\nTransaction logs with Memo:");
console.log(transaction?.meta?.logMessages);

// =============================================================================
// Demo Setup Helper Function
// =============================================================================