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go to Play Store and download the Package names app . open it and you will see the apps that are installed on your phone.
or
Try running simple adb commands
adb connect 192.168.xxx.xxx:5555 (your watch IP address & enable debugging)
adb shell
pm list packages
You will get an output list like this only much longer
package:com.android.cts.priv.ctsshim
package:com.google.android.ext.services
package:com.android.providers.telephony
The app ID is the text after package:
for example
package:com.android.providers.telephony
is
com.android.providers.telephony
hope this helps,
Ron
Samsung Developer Relations