UX Design por pre paid service in an app

Hi this test because we are looking for a graphical designer (UX) for some project, actually we have in a fintech app and from that app the user can pre paid his phone to use internet or make phone calls, out design its simple I include a document explaining what we need (remember is a small project to create new ones). We are looking for UX Designers located close to Mexico specially because of the time difference. We worked with sketch.