{
  "name": "Reseller API",
  "version": "1.0",
  "auth": "X-API-Key + X-API-Secret headers required",
  "endpoints": {
    "GET /balance":   "Account balance",
    "GET /cards":     "List available cards (?country=BR&limit=20)",
    "POST /buy":      "Buy card with auto-check {cardId: int}",
    "GET /history":   "Purchase history",
    "GET /settings":  "Reseller margin settings",
    "POST /settings": "Update margin {margin: 0-500}"
  },
  "min_balance": 200,
  "rate_limits": {
    "general": "60/min",
    "buy": "30/min"
  }
}