Error Handling

async function handlePayment(authorization, signature) {
  try {
    // 1. Verify payment
    const verifyResponse = await fetch(
      "https://facilitator.0xmeta.ai/v1/verify",
      {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          transaction_hash: authorization.nonce,
          chain: "base-sepolia",
          seller_address: merchantAddress,
          expected_amount: authorization.value,
          expected_token: authorization.token,
          metadata: {
            source: "my_app",
            paymentPayload: {
              x402Version: 1,
              scheme: "exact",
              network: "base-sepolia",
              payload: { authorization, signature },
            },
          },
        }),
      }
    );

    if (!verifyResponse.ok) {
      const error = await verifyResponse.json();
      handleVerificationError(error);
      return;
    }

    const { verification_id } = await verifyResponse.json();

    // 2. Settle payment
    const settleResponse = await fetch(
      "https://facilitator.0xmeta.ai/v1/settle",
      {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          verification_id,
          destination_address: merchantAddress,
        }),
      }
    );

    if (!settleResponse.ok) {
      const error = await settleResponse.json();
      handleSettlementError(error);
      return;
    }

    const settlement = await settleResponse.json();
    console.log("Settlement initiated:", settlement.settlement_id);
  } catch (error) {
    console.error("Network error:", error);
    // Retry logic here
  }
}

function handleVerificationError(error) {
  switch (error.error.code) {
    case "verification_failed":
      if (error.error.details?.reason?.includes("expired")) {
        alert("Authorization expired. Please try again.");
      } else if (error.error.details?.reason?.includes("signature")) {
        alert("Invalid signature. Please reconnect your wallet.");
      }
      break;

    case "invalid_request":
      console.error("Invalid request:", error.error.details);
      break;

    default:
      alert("Verification failed: " + error.error.message);
  }
}

function handleSettlementError(error) {
  switch (error.error.code) {
    case "insufficient_allowance":
      alert(
        "Merchant setup required. Please contact support.\n\n" +
          "Treasury: " +
          error.error.details.treasury_address
      );
      break;

    case "settlement_failed":
      if (error.error.message.includes("expired")) {
        alert("Payment authorization expired. Please try again.");
      } else if (error.error.message.includes("used or canceled")) {
        alert("This payment has already been processed.");
      }
      break;

    case "not_found":
      alert("Verification not found. Please start over.");
      break;

    default:
      alert("Settlement failed: " + error.error.message);
  }
}