Lets say i have an invoice A0001 and A0020

OpenERP should check every X hr, if a new bank transaction with the invoice nr arrived at your bank account. (.. or sync the whole process etc)

Basically something like sync Bank account and Finance. Or just inform you that a statement arrived or just that something happend.

is there a module for that purpose already existing? If not how would you basically achieve that? What API/Framework/language .... do i need to google to realize or create a module like that?

greetings