curl https://api.stablegenius.co/v1/payment-intents/pi_xyz789 \
  -H "Authorization: Bearer sk_test_abc123"

{
  "id": "pi_xyz789",
  "object": "payment_intent",
  "status": "confirmed",
  "amount": 4.50,
  "currency": "usd",
  "net_amount": 4.455,
  "fee": 0.045,
  "merchant_id": "mer_abc123",
  "payment_address": "0x1a2b3c4d5e6f7890abcdef1234567890abcdef12",
  "chain": "base",
  "token": "USDC",
  "qr_payload": "ethereum:0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913@8453/transfer?address=0x1a2b3c4d5e6f7890abcdef1234567890abcdef12&uint256=4500000",
  "qr_image_url": "https://api.stablegenius.co/v1/qr/pi_xyz789.png",
  "tx_hash": "0xabc123def456789012345678901234567890abcdef",
  "confirmed_at": "2026-04-01T20:00:12Z",
  "expires_at": "2026-04-01T20:05:00Z",
  "metadata": {
    "order_id": "order_456"
  },
  "created_at": "2026-04-01T20:00:00Z"
}

{
  "id": "pi_xyz789",
  "object": "payment_intent",
  "status": "awaiting_payment",
  "amount": 4.50,
  "currency": "usd",
  "merchant_id": "mer_abc123",
  "payment_address": "0x1a2b3c4d5e6f7890abcdef1234567890abcdef12",
  "chain": "base",
  "token": "USDC",
  "qr_payload": "ethereum:0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913@8453/transfer?address=0x1a2b3c4d5e6f7890abcdef1234567890abcdef12&uint256=4500000",
  "qr_image_url": "https://api.stablegenius.co/v1/qr/pi_xyz789.png",
  "expires_at": "2026-04-01T20:05:00Z",
  "metadata": {
    "order_id": "order_456"
  },
  "created_at": "2026-04-01T20:00:00Z"
}