NG ConnectionPack Guide
The first thing required to connect REST services is to register your application. This is usually done by creating an account in the developer's zone of the corresponding service provider web site, and then filling the application description data, such as the Name, Logo, and some other parameters. Some services force to specify more important parameters, such as application type, so called redirect page, and a set of APIs used.
As a result you'll get application's ClientID and Secret codes. Provided ClientID and Secret values should be copied into corresponding properties of the NG ConnectionPack components.
Its important to note here that the account used for registering the application, and end-user accounts, which will be used later for authentication - are different. So, if you personally use the corresponding services, this does not mean that your personal data will be accessible to your application users.
Provided ClientID and secret values should be considered as a private data of application. So, its not a good idea to show it to users. Also, note, that usually, service providers allow to register more than one applications from a single account.
Following is a step-by-step instructions of how to register application in all supported services:
•Google Registration (for Google Drive, Google Calendars and Google Tasks)