I am looking for to build a very simple, mobile responsive web app that will primarily be run on a tablet device (details within the attached). The web app will also need to integrate with the SumUp Reader for processing payments received on EMV hardware. There are SDKs and APIs available ([login to view URL]) which to me seem very straight forward, unfortunately, I just do not have the time to dig in. Previous experience using SumUp in a similar manner is a plus. Requirement for strict 3-day turnaround time.