curl --request POST \
  --url https://sandbox-api.shipbob.com/2026-01/variant/{variantId}:merge \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
[
  {
    "id": 0
  }
]
'

{
  "created_on": "2019-08-24T14:15:22Z",
  "id": 0,
  "name": "string",
  "taxonomy": {
    "id": 0,
    "name": "string",
    "parent_id": 0,
    "parent_name": "string",
    "path": "string"
  },
  "type": "string",
  "updated_on": "2019-08-24T14:15:22Z",
  "user_id": 0,
  "variants": [
    {
      "additional_hazmat_attributes": {
        "charge_state_percentage": 0.1,
        "container_metal": true,
        "container_type": "string",
        "lithium_battery_packaging": "string",
        "lithium_battery_type": "string",
        "magnet": true,
        "net_volume": 0.1,
        "net_weight": 0.1
      },
      "associated_bundles": [
        {
          "product_id": 0,
          "product_name": "string",
          "quantity": 0,
          "variant_id": 0,
          "variant_sku": "string"
        }
      ],
      "barcodes": [
        {
          "sticker_url": "string",
          "value": "string"
        }
      ],
      "bundle_definition": [
        {
          "product_id": 0,
          "quantity": 0,
          "variant_id": 0,
          "variant_name": "string",
          "variant_sku": "string"
        }
      ],
      "channel_metadata": [
        {
          "channel_id": 0,
          "channel_name": "string",
          "currency": "string",
          "id": 0,
          "is_inventory_sync_enabled": true,
          "legacy_product_id": 0,
          "platform": "string",
          "platform_identifier": "string",
          "platform_inventory_item_id": "string",
          "price": 0.1,
          "seller_sku": "string"
        }
      ],
      "created_on": "2019-08-24T14:15:22Z",
      "customs": {
        "country_code_of_origin": "string",
        "currency": "string",
        "description": "string",
        "hs_tariff_code": "string",
        "is321_eligible": true,
        "value": 0
      },
      "dimension": {
        "height": 0.1,
        "is_locked": true,
        "length": 0.1,
        "source": "string",
        "unit": "string",
        "width": 0.1
      },
      "fulfillment_settings": {
        "dangerous_goods": true,
        "is_bpm_parcel": true,
        "is_case_pick": true,
        "msds_url": "string",
        "requires_prop65": true,
        "serial_scan": {
          "exact_character_length": 0,
          "is_enabled": true,
          "prefix": "string",
          "suffix": "string"
        }
      },
      "gtin": "string",
      "id": 0,
      "inventory": {
        "inventory_id": 0,
        "on_hand_qty": 0
      },
      "is_digital": true,
      "is_image_uploaded": true,
      "lot_information": {
        "is_lot": true,
        "minimum_shelf_life_days": 0
      },
      "merge_children": [
        {
          "channel_ids": [
            0
          ],
          "completed_at": "2019-08-24T14:15:22Z",
          "inventory_id": 0,
          "variant_id": 0,
          "variant_name": "string"
        }
      ],
      "name": "string",
      "packaging_material_type": {
        "id": 0,
        "name": "string"
      },
      "packaging_requirement": {
        "id": 0,
        "name": "string"
      },
      "return_preferences": {
        "backup_action": {
          "id": 0,
          "name": "string"
        },
        "instructions": "string",
        "primary_action": {
          "id": 0,
          "name": "string"
        },
        "return_to_sender_backup_action": {
          "id": 0,
          "name": "string"
        },
        "return_to_sender_primary_action": {
          "id": 0,
          "name": "string"
        }
      },
      "reviews_pending": [
        "string"
      ],
      "sku": "string",
      "status": "string",
      "upc": "string",
      "updated_on": "2019-08-24T14:15:22Z",
      "weight": {
        "unit": "string",
        "weight": 0.1
      }
    }
  ]
}