n8n WhatsApp Group Moderation via Wafly Webhook: Block Spam Links

Block WhatsApp link spam automatically—using an n8n workflow with a Wafly webhook

This n8n automation moderates your WhatsApp groups by auto-approving join requests, sending welcome messages to new members, and removing disallowed link spam posted by non-admins—based on an allowed-domain list.

What this workflow does

• Receives WhatsApp group events via a Wafly webhook, using the incoming payload from Wafly.
• Loads your configuration, including:
  • an admin phone list (to verify who is allowed to post links)
  • an allowed-domain list (domains that are permitted)
• Auto-approves membership: when an approval request arrives, it approves the participant through Wafly.
• Sends welcome messages: when a new member joins, it sends a welcome message via Wafly.
• Scans group messages for URLs: on each group message, it checks whether the sender is an admin and evaluates each link’s domain against the allowlist.
• Deletes disallowed spam from non-admins: if a non-admin posts links with disallowed domains, the workflow deletes the message via Wafly and posts a short explanation in the group.

Use cases

• Protect community WhatsApp groups from phishing and spam links while keeping admin posting unrestricted.
• Reduce manual admin workload by automatically approving join requests and welcoming new members.
• Enforce posting policies for communities that only allow links to specific websites or services.

Technical details

• Core integration: n8n-nodes-wafly (Wafly webhook + Wafly actions to approve, send messages, and delete spam).
• Workflow logic nodes: if, set, code, switch, no op (used to drive moderation decisions and message handling).
• Setup highlights: self-host n8n, create a Wafly API credential for a group-admin number, register the webhook Production URL, then update admin phone numbers and allowed domains in the configuration.