Why does making a get_contacts request to Google+ results in "cannot get Google+ contacts" error message?

A very common problem many of our customers run into with trying to get the contacts of a Google+ user is a error message containing the information "cannot get Google+ contacts".

As with most errors that occur within the modal login window, this error is due to an improperly configured provider application, in this case, a Google Application. To solve this problem, you will need to log in to your Google Developer Account, and add the Contacts API to your application.

Navigate to https://console.developers.google.com, log into your Google Developer Account, and manage your application that you use with Janrain Social Login. Under the menu on the left "API's and Auth", select the "API's" screen.

Once here, you will want to check that "Contacts API", as well as Google+ API are both turned on and listed in the top API section. If it does not appear there, locate it in the "Browse API's" Section, and turn it on. This should resolve the error message in the modal window.