PayPal Cordova nie może otworzyć okna wyskakującego - zablokowane
you may want to check this plugin published: cordova-plugin-inappbrowser-popup-bridge. It adds support to Cordova InappBrowser for Braintree's PopupBridge which adds popup window emulation to iOS and Android apps for the purpose of making PayPal payments within native app Webviews
Ivan The Terrible