Verification Logic

When a Payment-Proof is sent, the verification layer ensures:

• The transaction exists on Solana.

• The correct recipient and amount are paid.

• The memo matches the requestId.

• The payment hasn’t been reused or expired.

Verification uses Solana RPC nodes or indexers (Helius / Triton).

import { verifyPayment } from "@402gate/sdk/utils";

const isValid = await verifyPayment(txHash, requestId, {
  recipient: "MERCHANT_PUBKEY",
  amount: 0.002,
  mint: "402G"
});