Ionic developer

I nead a developer who know ionic I want to have 5 small changes in my app 1) cash free payment integration 2) live chat intrigation 3) copun code discount - percentage Limitizer on copun. 4) in Passenger detail and sine up page in this phone number section is their but the numbers starting from 6 are not accepting. 5) Limitization put to wallet at using discount in coupon (max discount)