Warum sind die Start- und Endzeiten von GoHighLevel-Terminen in meinem Webhook leer?

Fix our GoHighLevel Outbound Webhook workflow where appointment.start_time and appointment.end_time arrive blank:
1. Check the workflow trigger and replace any Contact-scoped trigger (like Contact Tag Added or Opportunity Changed) with "Appointment Status" (Status = Confirmed) or "Customer Booked Appointment".
2. Add a native "Format Data — Date/Time Formatter" action before the Outbound Webhook to format {{appointment.start_time}} and {{appointment.end_time}} as ISO-8601 timestamps.
3. Map the formatted timestamps into explicit Custom Data keys on the Outbound Webhook action.

# 1. MCP Tool Call (ghl-crm-mcp)
{
  "tool": "workflows_create_from_recipe",
  "arguments": {
    "location_id": "<YOUR_LOCATION_ID>",
    "recipe": "appointment_iso_timestamp_webhook",
    "trigger": "appointment_status_confirmed"
  }
}

# 2. Or run via ghl-crm Rust CLI
ghl-crm workflows apply-recipe --location-id <YOUR_LOCATION_ID> --recipe appointment-iso-webhook

Official GHL MCP vs. ghl-tools: HighLevel’s official hosted MCP (services.leadconnectorhq.com/mcp) covers public v2 CRM records (contacts, opportunities, appointments, conversations). ghl-tools MCP complements it with workflow graph inspection & recipes, funnel/form builders, DNS/BIMI checks, and ghl-crm doctor audits.