Upgrade Android/iOS Application to the final version and fix minor issues

We have a mobile app that runs on Android and iOS. The application is build on native code for both platforms. This application is bought by a third party and the current and final code are already developed but there are some issues that need to be fixed. This is the app link https://ridy.io/taxi and this is our current app: https://play.google.com/store/apps/details?id=com.upstaxi.taxi.rider https://play.google.com/store/apps/details?id=com.upstaxi.taxi.driver
https://apps.apple.com/us/app/ups-taxi/id1477752265
https://apps.apple.com/us/app/ups-taxi-driver/id1477752552

The issues that needs to be solved are:
The travel cost must be similar to both client and driver app.
Route price must be calculated from car to pickup to destination.
The ride ETA displays always soon.
The car icon and location are always displayed with a delay.
Setting different payment methods: EUR with PayPal and ALL with Cash
iOS Notification currently not working
Message notification should go inside the app messages and not only open the app.
Notification sound should be changed to another sound with more duration and more loud.

We are currently open to offers for a long term developer which can help us in the future to fix new issues that may show up.