When your user opens your app for the first time we communicates with Google servers in case of Android, and Apple servers in case of iOS to generate a unique ID for this device. This registration ID is important in case you wanted to re-target this device again in the future. 

To get the registration ID via PushBots you can use the following method: 

For iOS 

For Android 

String registrationId = Pushbots.sharedInstance().getGCMRegistrationId();

For Phonegap

window.plugins.PushbotsPlugin.on("user:ids", function (data) {
  console.log("user:ids" + JSON.stringify(data));
// userToken = data.token;
// userId = data.userId
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