Removes a consignment and all its items. Note: you can only remove unprinted consignments.
ConsignmentID - An ID from the List Consignments method.
A data structure like:
{ 'result': { 'Success': true, 'ConsignmentID': '1' } }
https://api.fastway.org/v3/fastlabel/removeconsignment?ConsignmentID=1&api_key=YOUR_API_KEY