Zapier's official WhatsApp connector doesn't allow sending messages to others; it only allows sending messages to your private number, and only using specific templates. This works when you want to get notified, for example, whenever there's a new sale. However, it's very limited if you want to notify contacts, clients, prospects, etc.
However, there are third-party apps that can help!
Learn how to sync InvestNext webhooks into HubSpot via Zapier (or Make) with event mapping, object modeling, idempotency, retries, logging, and monitoring to prevent duplicates.