User with an Android phone who is having issues in purchasing coins using their mobile load, please do the following.
1. Go to pay.google.com
2. Remove your mobile number
3. Go back to Kumu and then buy coins
4. Choose the desired amount of coins
5. Tap on GPay
6. Choose (Network) billing
7. Enable it
8. Proceed with the purchase
Table for Error Code:
How to fix Error - onFail responseCode=6
The Error Code 6 means that there was an issue communicating with the Google Play app on the phone (various possible reasons).
1) Reboot the device and try the purchase again
2) Make sure that the Google Play app is up to date - Open Google Play > tap the side menu button > tap Settings > tap on "Build version" to have it check that you have the latest ( more info). Then try the purchase again.