Our app can reply to a rental listing for you by replaying a form-filling recipe you recorded once. The most important code in that feature is not the part that fills forms. It is the part that refuses to. Here is the scenario it exists for. You are on a listing on some aggregator. You click "Contact landlord". The aggregator does not have a contact form — it hands you off to a completely different company's site, which asks you to register an account, verify an email, and pay €29.99 for a "p...