Retén la comisión del router hasta que la llamada sea final. 

// The relayer, after it has read a successful USDC transfer into the vault.
import { recordSaleIx, COMMISSION_LEN } from "./commish/program";
import { createHash } from "node:crypto";

// The order hash is bound to the payment signature; the relayer also refuses a payment whose closed commission was recorded before.
const hash = createHash("sha256").update("commish:x402:" + campaign + ":" + paymentSig).digest();
const { instruction } = await recordSaleIx({
  attestor: relayer.address,    // the key named by the campaign
  payer: relayer.address,       // rent for the commission account
  campaign,
  vault,
  orderHash: hash,
  orderAmount: 50_000n,         // 0.05 USDC paid by the agent, 6 decimals
  creator: router,              // from the payment memo commish:<router>
  lamports: await rpc.getMinimumBalanceForRentExemption(BigInt(COMMISSION_LEN)).send(),
});
await sendAndConfirm([instruction], [relayer]); // your usual send helper