v3.1

added track id to invoice interface

v2.9: Added ability to post rejection message to RSO

Allows QT to return a message along with the rejection status to enable user to know why was the invoice rejected

v2.8: Merge pull request #8 from QbilSoftware/added-invoice-type

+ added getter got vat code

v2.7: Merge pull request #7 from QbilSoftware/added-invoice-type

+ added setter for allocated invoice

v2.6: Merge pull request #6 from QbilSoftware/added-invoice-type

+ added invoice type

v2.5: Merge pull request #4 from QbilSoftware/added-invoice-type

+ added invoice type

v2.4: Merge pull request #3 from QbilSoftware/added-few-fields

Added diesel-surcharge, qty per box and no of boxes to invoice and in…

v2.2

fixes bug in InvoiceInterface

v2.1: Added methods to interface

Removed potential side effect causing code

Release v1.5

+ Deprecated Invoice::extract() and Client::extract() method