one or many line_item objects. A line_item object has 7 attributes: name, quantity, type, currency, unit_amount_subunit, image_url, description. Example: "line_items": [ {"name": "some product", "quantity": "1","type": "product", "currency": "USD","unit_amount_subunit": "1999", "image_url": "https://xxxx.jpg", "description": "This is something"}, { "name":"some product", "quantity": "1", "type": "product", "currency": "USD","unit_amount_subunit": "1999", "image_url": "https://xxxx.jpg","description": "something" }, {"name": "Sales Tax(15%)","type": "tax", "currency": "USD", "unit_amount_subunit": "899"}]