WhatsApp Auto-Messaging Integration

I need a straightforward way to add automated messaging to my WhatsApp account. Whenever a new message comes in—from anybody—I want a predefined response (or a series of responses) to be sent automatically without me lifting a finger.

Here’s what I’m looking for:
• A lightweight script, bot, or API-based solution that connects to WhatsApp and listens in real time.
• Easy editing of the reply text so I can change the message whenever needed.
• Clear setup instructions so I can deploy it on my own computer or preferred cloud service after you hand it off.
• Basic logging so I can see when and to whom each auto-reply was sent.

I’m comfortable granting temporary test access if that speeds things up, but I’ll need the final code and documentation so I remain fully independent once the project ends. If you’ve built similar WhatsApp automations before, please let me know—speed and reliability matter most to me.