Box calculator library

Fixed

• fixed receiving additional services for variable products

Improved

• updated shipment tracking links
• created a function when want to save several metadata to an order to reduce the number of requests
• added platform and version identification to all requests to the Omniva server
• added box calculator library
• all shipment size calculation functions have been changed to a single function that uses the box calculator library

Updated

• updated Omniva API library to v1.3.2