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Optional endpoint for merchants to verify payment status. Returns the transaction details and signed proof if the payment is complete.

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Use Cases

  • Merchant wants to verify a payment they didn’t receive a webhook for
  • Merchant’s webhook handler failed and needs to recover
  • Auditing and reconciliation

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Implementation

app.get('/verify/:txid', async (req, res) => {
  const { txid } = req.params;

  // 1. Find the transaction
  const payment = await db.getPayment(txid);
  if (!payment) {
    return res.status(404).json({
      error: { code: 'TXID_NOT_FOUND', message: 'Transaction not found' }
    });
  }

  // 2. Build response based on status
  if (payment.status === 'pending_settlement') {
    return res.json({
      status: 'pending',
      txid: payment.txid,
      amount: payment.amount,
      currency: payment.currency,
      createdAt: payment.createdAt,
      expiresAt: payment.expiresAt
    });
  }

  if (payment.status === 'completed') {
    // Reconstruct the proof
    const proof = {
      txid: payment.txid,
      issuer: YOUR_OCID,
      from: payment.from,
      to: { ocid: payment.merchantOcid, reference: payment.orderId },
      amount: payment.amount,
      currency: payment.currency,
      timestamp: payment.completedAt,
      memo: payment.memo
    };

    const signature = signProof(proof);

    return res.json({
      status: 'completed',
      proof,
      signature
    });
  }

  // Handle other statuses (failed, expired, etc.)
  res.json({
    status: payment.status,
    txid: payment.txid
  });
});

​
Response Examples

Completed payment: 
{
  "status": "completed",
  "proof": {
    "txid": "gateway_tx_456",
    "issuer": 300,
    "from": { "ocid": 200, "reference": "wallet_tx_123" },
    "to": { "ocid": 500, "reference": "ord_abc123" },
    "amount": "99.99",
    "currency": "USD",
    "timestamp": 1706500500
  },
  "signature": "a1b2c3..."
}
Pending payment: 
{
  "status": "pending",
  "txid": "gateway_tx_456",
  "amount": "99.99",
  "currency": "USD",
  "createdAt": 1706500000,
  "expiresAt": 1706503600
}
Failed/expired: 
{
  "status": "expired",
  "txid": "gateway_tx_456"
}