(FIXED PROJECT PAYMENT) - Looking for Expert Developer to Resolve App Issues and Implement Custom Payment Integration

********************Over Budget & change price will be removed and rated.********************* I am looking for a proficient developer and UI designer with over 5 years of experience and a proven track record. I need payment integration for a system that does not have an SDK, so you must have strong coding skills to implement it into my app with all the required details. ********************Over Budget & change price will be removed and rated.********************* Issues to be fixed include: The currency symbol/logo is not appearing correctly. The live tracking of the delivery boy stops when the phone is locked. This needs to be resolved so that the tracking continues even when the phone is locked, as keeping the phone screen on continuously drains the battery quickly. ********************Over Budget & change price will be removed and rated.********************* Thank you