curl -X GET '/crypto-gateway/payments' \
  -H 'Authorization: Bearer YOUR_ACCESS_TOKEN'

{
  "success": true,
  "data": {
    "payments": [
      {
        "payment_id": "pi_01abc123",
        "amount": 49.99,
        "currency": "USD",
        "status": "paid",
        "description": "Pro Plan - Monthly",
        "paid_asset": "USDC",
        "paid_chain": "base",
        "created_at": "2026-04-01T11:00:00Z"
      }
    ]
  }
}