Changes to Create a Commercial Invoice

added the new required request property packages/items/amount

added the new required request property packages/items/cost

added the new required request property packages/items/cubicMeters

added the new required request property packages/items/declaredValue

added the new required request property packages/items/totalWeight

added the new optional request property customsSettings/itn

added the new optional request property destination/taxId

added the new optional request property origin/taxId

added the new optional request property packages/items/currency

added the new optional request property packages/items/weightUnit

added the new optional request property settings

added the new optional request property shipment/orderReference

added the new envia_guaranteed enum value to the request property customsSettings/dutiesPaymentEntity