It's possible to print a monthly statement giving a summary of all parking sessions you have purchased with the RingGo parking service for a particular month. To retrieve this statement, login to my RingGo account and select 'Receipts' from the navigation bar. If you then set the relevant month you require the satement for and click 'Display a printable statement', you can print as required.
You should note that the monthly statement is not a VAT receipt. VAT receipts should be printed/emailed separately or in bulk for each individual RingGo session as a personal user of the service.