There are plenty of RFID systems to choose from but the best RFID systems have an OPEN API. This allows for integration with other systems, apps, blockchain and biometric solutions and effectively future proofs your system. 

When you have OPEN API connectivity you have a world of possibilities with your event data. Integrated technology means that you can mix and match solutions from companies dedicated to what they do best. 

A cashless event solution does not necessarily have to integrate with ticketing. If it does, then it allows extra possibilities for personalization and seamless top up in advance of an event.

If the two systems (ticketing & RFID) are not connected data has to be transferred from one system to another when selling credit in advance. This means there has to be a cut off in ticket/credit sales at some stage prior to the event to allow for a data dump When ticketing and RFID are connected via an API you never have to stop selling tickets and credit- as the data flows seamlessly.