Improvement an existing app developed in Angular and Ionic

If you can Improve the existing App, as the project is in Ionic we would need iOS side as well.

1 - Recharge wallets are not working, once the user make the transaction (backend with Stripe) seems that transaction, or it's not doing anything, or transaction completes but amount is not showed in the Wallet Screen
2- Option to share app via Whatsapp, it just say "Cannot be done"
It's neccesary to set that can be shared and also include the link where people can download the app in google play store
3- This issue error message appears all the time in the chat feature

More details will be discussed with candidate.

Thanks.