Build a WhatsApp chatbot with n8n + WaSphere (self-hosted, no Meta approval)

Users can build a WhatsApp chatbot by combining n8n, an open-source workflow automation tool, with WaSphere, a free MIT-licensed self-hosted WhatsApp API. This architecture allows deployment on a VPS using Docker, bypassing Meta business verification, template approvals, and per-conversation pricing. WaSphere connects via QR code, providing a REST API and HMAC-signed webhooks. This self-hosted stack ensures conversation data remains within the user's own infrastructure while eliminating the need for Business Service Providers or platform fees.