Checkbox

Include extra pair of headphones?

    "ui_objects": [
      {
        "type": "DROPDOWN",
        "id": "extra",
        "title": "Include extra pair of headphones?",
        "force_input": true,
        "add_to_price": [
           50000000, // Bitcoin
           300000000 // Particl
         ]
        ]
      }
    ]