http://www.receipt-bank.com/
Its not a banking system as such, its a service for sending purchase receipts, invoices etc to as images or pdfs, the data gets stripped out of them, you can then read it back... gives you a good head start on processing things like invoices..
Api docs should be attached... it doesn't look hard, I just considered if someone had it already done and tested, it could be worth a few $ if they wanted to share...
EDIT, ok, docs didn't load... here are urls
https://receiptbank.zendesk.com/attachments/token/6tlhv1rW5pUDCjmEjaylnSTHr/?name=IntegrationDocumentation.pdf
https://receiptbank.zendesk.com/attachments/token/KB5btJYygIf3gIU6ThVEIqqTk/?name=RB-OAuth.pdf
Callum