The main thing is to plan how information should move between systems before connecting everything. Clear data formats, reliable authentication, error handling, and monitoring can make a big difference later. I also think it helps to work with api integration service providers when a project involves several existing platforms or unusual technical requirements. They can help structure the connections instead of treating each integration as a separate task. It is easy to overlook small details at the beginning, though, and those details often matter once the system grows.