Verify a Payment

export async function verifyTokenPayment(args: {
  hash: Hash;
  token: Address;
  payer: Address;
  merchant: Address;
  amount: string;
  memo?: `0x${string}`;
  orderId: string;
  store: PaymentStore;
}) {
  const receipt = await publicClient.waitForTransactionReceipt({ hash: args.hash, confirmations: 2 });
  if (receipt.status !== "success") throw new Error("Transaction reverted");
  const expectedAmount = parseUnits(args.amount, 6);
  const transfers = parseEventLogs({ abi: tokenEvents, eventName: "Transfer", logs: receipt.logs, strict: true });
  const transfer = transfers.find(
    (log) =>
      log.address.toLowerCase() === args.token.toLowerCase() &&
      log.args.from.toLowerCase() === args.payer.toLowerCase() &&
      log.args.to.toLowerCase() === args.merchant.toLowerCase() &&
      log.args.amount === expectedAmount,
  );
  if (!transfer) throw new Error("Expected payment transfer not found");
  const memos = parseEventLogs({ abi: tokenEvents, eventName: "Memo", logs: receipt.logs, strict: true });
  if (args.memo && !memos.some((log) =>
    log.address.toLowerCase() === args.token.toLowerCase() &&
    log.logIndex === transfer.logIndex + 1 &&
    log.args.memo === args.memo
  )) throw new Error("Expected adjacent memo not found");
  if (!(await args.store.claimOnce(args.hash, args.orderId))) throw new Error("Payment already used");
}