Hello,
As i checked that your this application has already been developed by someone other developer, but having some issues which we need to rectifying them. we are most proficient developer team for multi crypto's coins wallet and exchange system app development. here please have a look at them our developed apps . please could you share to me that main app code with bugs list. please have a look our developed apps functions. in Additional required web admin with web service API code too, for more do cover all necessary modification in admin database wit web API.
ERC20 wallet app
[login to view URL]
Ethereum wallet system app
[login to view URL]
[login to view URL]
pre paid wallet app
[login to view URL]
peer to peer exchange app
[login to view URL]
ripple wallet app
[login to view URL]
Cipher Browser fordice dapp app
[login to view URL]
coins tracking app
[login to view URL]
Regards