x402 Refund Protocol

import { EscrowServerScheme } from "@x402r/evm/escrow/server";
import { refundable } from "@x402r/helpers";
...
app.use(
  paymentMiddleware(
    {
      "GET /weather": {
        accepts: [
          refundable({
            scheme: "escrow",
            price: "$0.01",
            network: NETWORK_ID,
            payTo: account.address,
          }, operatorAddress),
        ],
        description: "Weather data",
      },
    },
    new x402ResourceServer(facilitatorClient)
      .register(NETWORK_ID, new EscrowServerScheme()),
  ),
);

import { registerEscrowScheme } from "@x402r/evm/escrow/facilitator";
...
const facilitator = new x402Facilitator();

registerEscrowScheme(facilitator, {
  signer: evmSigner,
  networks: NETWORK,
});