Push Plugin issue in iPhone - API stops working

Our hybrid application on ionic framework invokes various JSON APIs which works perfect in iOS (9x, 8x, using xcode 7.1) until I introduce the latest Push Plugin. Below are the plugins that we are using:
"https://github.com/Wizcorp/phonegap-facebook-plugin
"cordova-plugin-device",
"cordova-plugin-dialogs",
"phonegap-plugin-barcodescanner",
"cordova-plugin-splashscreen",
"cordova-plugin-statusbar",
"cordova-plugin-geolocation",
"cordova-plugin-media",
"cordova-plugin-camera",
"https://github.com/wymsee/cordova-imagePicker",
"cordova-plugin-whitelist",
"com.ionic.keyboard",
"phonegap-plugin-push"
As soon as I introduce phonegap push plugin (I followed this link to add this plugin: http://virteom.com/how-to-create-an-ipa-file-using-xcode), API invocation stops and I couldn't find any relevant error logs also. Appreciate any suggestions.