In Mexico, WhatsApp isn't a channel — it's the channel. It's where customers ask for prices, book appointments, and decide whether to buy from you or from the competitor who answered faster. And that last part is the problem: most small and medium businesses lose customers simply because nobody replied in time — after hours, during a rush, or while the owner was busy doing the actual work.
At Proxxa, the AI automation agency I run in Mexico City, this is the single most common pain we solve. So I want to walk through how I built a production-grade WhatsApp AI assistant that answers, qualifies, and books 24/7 — using Claude and n8n, with no third-party chatbot platform in the middle.
Why the WhatsApp Cloud API directly (no BSP)
A lot of guides will tell you that you need a BSP (Business Solution Provider) to use the WhatsApp Business API. You don't. Meta's Cloud API is hosted by Meta itself and you can build on it directly. Skipping the BSP means no per-seat middleman tax, full control over the logic, and the client owns their own number and data.
The stack
