The roles in your company that are needed to get this phase done are:
These are the tasks which need to be performed:
Who is going to able to support this and what is your escalation process?
Some supports tasks with interfaces are simple. It might be a matter of restarting a database or server.
Others might involve deeper skills of understanding databases and network communication. How is your support team structured? What skills are required? Do you need to design an ‘escalation process'?
Good idea to establish a process so that common problems are identified and well understood. Ideally these are good to eliminate if possible, otherwise documenting how to solve each problem is very effective.