List coupons (admin)

{
    "success": true,
    "message": "Success",
    "data": {
        "coupons": [
            {
                "code": "FIRSTPLAN20",
                "description": "20% off your first Sage or Guru \n    subscription (capped at Rs 200), locked in for renewals",
                "campaign_tag": "first_purchase_plan",
                "discount_type": "percent",
                "discount_value": 20,
                "max_discount_amount": 200,
                "first_purchase_only": true,
                "applicable_slugs": [
                    "sage-monthly",
                    "sage-quarterly",
                    "sage-half-yearly",
                    "sage-yearly",
                    "guru-monthly",
                    "guru-quarterly",
                    "guru-half-yearly",
                    "guru-yearly"
                ],
                "sticky_for_renewal": true,
                "max_redemptions_per_user": 1,
                "valid_from": 1752739200000,
                "valid_till": 1760688000000,
                "is_active": true
            }
        ],
        "total": 1,
        "page": 1,
        "limit": 20
    }
}