A tour app could bring payment deadlines, travel information and room arrangements into one place. The organiser would still need to distinguish a participant's preferences from a confirmed allocation.
Instalment records should show what is due, what has been received and whether a change is awaiting agreement. Room lists and private travel details need controlled access. Participants may need an itinerary they can still consult when a connection is unavailable, with the latest version clearly identified.
Map a sample tour before development, including late joiners, withdrawals and changed room requirements. Avoid collecting passport or health information unless it is genuinely needed and handled appropriately. A useful first version could focus on payments and the confirmed itinerary, then add accommodation management once the organising process is clear.
Related reading: Membership and Club Management Software.