You asked we obliged.
Turn invoicing of vouchers and  processing refunds from this :
To This!!
Herewith the link to the uploaded recording of the Invoicing Training Part II – Retrieval & refunds : https://youtu.be/veBW0JFbLB4
Hope it helps, you are most welcome to contact support or ourselves if you need any assistance.
Kind regards
QuickTrav Sales Team