  This paper provides a roadmap for designing the Global Digital Transport
Cards Application (GDTCA). GDTCA is an Android Application for people to get a
digital transport card online for any city and use it locally. People can top
up or withdraw the transport card by using GDT Cards App. It is worth noting
that such an application will have different local learning experiences based
on the sparsity of the environments, which can be aggregated using federated
learning and transport protocols.
