When users log in brainCloud with their Facebook credential, brainCloud fetches users' profile picture URLs and save them to users'
pictureUrl field by sending a Facebook Graph API with their access token.
For the time being of writing this article, the picture URLs fetched from Facebook are short-lived and temporary CDN URLs, brainCloud has to convert it to a permanent long-lived URL for users.
For example, convert the following temporary short-lived URL:
To use the converted
pictureUrl in your app properly, you will need to append app access tokens to it, something like the following,
You can also append users' access tokens to it if you want to use it with expiration.