I need a lightweight PHP add-on that hooks my current application to a reliable WhatsApp API so I can send messages directly from my system. The scope is intentionally small and focused: • Enable outbound messaging only—no inbound handling required. • Support three formats: – Plain text messages – Images or short videos – Interactive messages with buttons or quick replies A clean, commented PHP function or class, one configuration file, and a brief read-me explaining setup and usage are all I need. Keep external dependencies minimal; cURL or Guzzle is fine. If you have a tested snippet or can put together a simple demo page that proves each message type works, that will be perfect. Looking to get this running quickly, so concise, well-structured code and clear instructions will stand out.