v1.3.1

• [feature] Add user id to line item
• [feature] Add product variant id to line item

v1.3.0

• [feature] Add option to validate line items against the database. Product ID then must be provided and POS will validate that the product exists in our database and fetch data for it (like name, unit price)
• [feature] Add option to keep webview open after adding item to the basket, instead of immediately closing it
• [feature] Add LineItem.isExternalProduct field. External product means product is physically in a different location (e.g. a warehouse). External products will not support adding shipping on POS
• [feature] Add Basket.customerId field
• [improvement] Create a callback for addBasket function
• [improvement] Enforce variable types when creating basket
• [improvement] Validate required fields are set when creating basket. If any mandatory fields are missing, an exception will be thrown
• [improvement] Update supported transaction types: add Vipps, Dintero, Invoice, remove Point
• [bug] Fix message name for addBasket function
• [bug] Fix printDocumentWithData callback missing result