curl --location --request POST 'https://api.stateset.network/v1/invoice/pay' \
--header 'Authorization: Bearer YOUR_API_KEY' \
--header 'Content-Type: application/json' \
--data-raw '{
  "invoice_id": "inv_1234567890",
  "payment_method": {
    "type": "ssusd",
    "wallet_address": "stateset1qypqxpq9qcrsszg2pvxq6rs0zqg3yyc5lzv7xu",
    "amount": {
      "value": "5000.00",
      "denom": "ssusd"
    },
    "chain": "stateset"
  },
  "payment_details": {
    "full_payment": true,
    "early_payment_discount": true,
    "reference": "PMT-2024-001"
  },
  "metadata": {
    "memo": "Invoice payment for January services",
    "idempotency_key": "pay_inv_1234567890_001",
    "accounting_code": "REV-001"
  }
}'

{
  "success": true,
  "transaction": {
    "tx_hash": "E8F1B4C7D0A3E6F9C2B5E8F1D4C7A0B3E6F9C2B5",
    "block_height": 1234568,
    "timestamp": "2024-01-15T11:00:00Z",
    "gas_used": "80000"
  },
  "payment": {
    "payment_id": "pmt_abc123def456",
    "invoice_id": "inv_1234567890",
    "amount_paid": {
      "value": "4750.00",
      "denom": "ssusd",
      "usd_value": "4750.00"
    },
    "discount_applied": {
      "type": "early_payment",
      "amount": "250.00",
      "percentage": "5.0"
    },
    "status": "completed"
  },
  "invoice": {
    "invoice_id": "inv_1234567890",
    "status": "paid",
    "total_amount": {
      "value": "5000.00",
      "denom": "ssusd"
    },
    "amount_paid": {
      "value": "4750.00",
      "denom": "ssusd"
    },
    "balance_due": {
      "value": "0.00",
      "denom": "ssusd"
    },
    "payments": [
      {
        "payment_id": "pmt_abc123def456",
        "amount": "4750.00",
        "paid_at": "2024-01-15T11:00:00Z",
        "discount": "250.00"
      }
    ]
  }
}