At first you must think about the requirements and needed interface and other stuff like security, internet access and servers. Than you must make some architectual sketching for what I like
UML use case to cover all needed functions.
After that and some discussions with your project partners that you can start to code. Remember: The real coding starts very late in the project!!!
I think you will end in some HTML spitting and transaction server back end. Like that
QT backed webserver sample project.
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