# File lib/doorkeeper/oauth/client/credentials.rb, line 7
        def self.from_request(request, *credentials_methods)
          credentials_methods.inject(nil) do |credentials, method|
            method = self.method(method) if method.is_a?(Symbol)
            credentials = Credentials.new(*method.call(request))
            break credentials unless credentials.blank?
          end
        end