Transport users have long sought to be able to buy transport in one purchase to cover all aspects of their end to end journey. Over the past 50 years there have been many attempts to offer users these services, but most have survived for only a short time or in restricted markets. Technology now offers many new possibilities for more widespread joint ticketing approaches. This paper reviews how opening up payment systems could overcome many of the most important barriers to enable seamless payment for transport across all modes of travel.