{
  "success": true,
  "message": "Variants retrieved successfully",
  "data": {
    "id": "b6b6c2b0-...-uuid",
    "product_id": 501,
    "variation_type": "size",
    "variation_custom_label": "Size",
    "has_sub_variants": true,
    "total_quantity": 40,
    "variations": [
      {
        "id": "v-11111111-1111-1111-1111-111111111111",
        "sku": "SHIRT-M",
        "variant_label": "Medium",
        "variant_object": "{\"size\":\"M\"}",
        "variation_quantity": 20,
        "variation_add_price": 0,
        "variation_cost_price": 0,
        "order_index": 0,
        "sub_variation": {
          "id": "sv-...-uuid",
          "sub_variation_type": "color",
          "sub_variation_custom_label": "Color",
          "sub_variation_total_quantity": 20,
          "sub_variants": [
            {
              "id": "svt-...-uuid",
              "sku": "SHIRT-M-RED",
              "variant_label": "Red",
              "variant_quantity": 20,
              "subvariant_add_price": 0,
              "subvariant_cost_price": 0
            }
          ]
        }
      }
    ]
  }
}