> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://bdk.crisp.help/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# My app was previously built by another developer / service. Can I still use BDK Native?


## Yes. No problem if your app was built by another service / wrapper previously.

iOS
* Nothing needed for the app. 
* If push notifications were previously configured, it would be good to have the onesignal certificates. If not, we can generate fresh ones for you.

Android
* Make sure you have your android app listings 'Keystore file' and the password associated with it.
* If this is not provided, google won't let you sign a new apk for the app. It's the verification that you are the rightful owner of the listing
* Don't have it and developer isn't providing it. [Report to google that you've lost your keystore file ](https://support.google.com/googleplay/android-developer/contact/otherbugs)and request them to reset it.