linkedin <- oauth_endpoint("requestToken", "authorize", "accessToken",
base_url = "https://api.linkedin.com/uas/oauth")
github <- oauth_endpoint(NULL, "authorize", "access_token",
base_url = "https://github.com/login/oauth")
facebook <- oauth_endpoint(
authorize = "https://www.facebook.com/dialog/oauth",
access = "https://graph.facebook.com/oauth/access_token")
oauth_endpoints
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