def authorization_url(requested_scopes = ["public"])
      @oauth.auth_code.authorize_url(redirect_uri: Unsplash.configuration.application_redirect_uri,
                                     scope:        requested_scopes.join(" "))
    end
def authorization_url(requested_scopes = ["public"])
      @oauth.auth_code.authorize_url(redirect_uri: Unsplash.configuration.application_redirect_uri,
                                     scope:        requested_scopes.join(" "))
    end
Create a Connection object.
 @param version [String] The Unsplash API version to use.
 @param api_base_uri [String] Base URI at which to make API calls.
 @param oauth_base_uri [String] Base URI for OAuth requests.
 Get OAuth URL for user authentication and authorization.
 @param requested_scopes [Array] An array of permission scopes being requested.
 @return [String] The authorization URL.