@property<EOL><INDENT>def external_submission_url(self):<DEDENT>
if self.config.get("<STR_LIT>") == "<STR_LIT>":<EOL><INDENT>return "<STR_LIT>"<EOL><DEDENT>return "<STR_LIT>"<EOL>
On experiment completion, participants are returned to
        the Mechanical Turk site to submit their HIT, which in turn triggers
        notifications to the /notifications route.