Related to security issues in your app or OP simply getting his API keys compromised by something that was his entirely responsibility (e.g malware in his device, phishing, etc...). I'm not trying to spread any FUD, but if there is any possibility of your app being vulnerable in anyway, you need to disclose it.

I myself have used your app for quite some time and only stopped recently because you do not support my favorite local exchange, but I still have the app installed in my phone. I don't want to risky anything because of a possible issue on your part. =/

Now, if the issue is on your hands, OP, I can't see why TabTrader would return anything to you. Electrum or Bitcoin Core don't reimburse people if they get hacked or download a fake wallet.