Show HN: AI-Generated N8n Templates Gallery (n8ntemplates.me)

A new n8n automation template lets teams automatically send personalized WhatsApp welcome messages from leads stored in Google Sheets using the Rapiwa API — a low-cost (≈$5/month) alternative for groups not using the official WhatsApp Business API. The workflow polls a sheet every 5 minutes, validates phone numbers through Rapiwa, sends messages with a customizable template, and writes delivery status back to the sheet. It’s aimed at sales, marketing, and support teams looking to scale outbound engagement without building a bespoke integration. Technically, the flow uses Google Sheets (OAuth2) to fetch rows where “check” is set, cleans numbers to international format, calls Rapiwa’s verify (https://app.rapiwa.com/api/verify-whatsapp) and send (https://app.rapiwa.com/api/send-message) endpoints with a Bearer token, and processes up to 60 messages per run with a 5-second inter-message delay to avoid throttling. It updates columns (including the quirky required column name "name " with a trailing space) to mark verified/sent or unverified/not sent, and supports extensions like media, multilingual text, separate failure logs, and admin alerts. Important caveats: follow WhatsApp rules and consent practices, ensure correct international formatting, watch API rate limits, and secure your Rapiwa token and sheet access.