Send WhatsApp conversion event — estimate

User email. Normalized + SHA-256 hashed before sending to Meta.

Conversion value (e.g. order total).

Stable dedup key. Reuse to suppress duplicate events (Meta dedupes against pixel events with the same id).

ISO 4217 currency code (e.g. USD).

Meta test_event_code passthrough. Routes the event to the Test Events tab in Events Manager instead of the production dataset, useful for development.

WhatsApp SocialAccount ID.

Live-verified allowlist of event names accepted by Meta's CAPI for Business Messaging (Graph API v25.0). Other standard pixel events including Lead, CompleteRegistration, Subscribe, Schedule, Contact, StartTrial, AddPaymentInfo, Search, and SubmitApplication are rejected with subcode 2804066 ("Messaging Event Invalid Event Type") on action_source = business_messaging events. Custom event names are also rejected.

Use LeadSubmitted (NOT Lead) for lead-style conversions.

Unix seconds. Defaults to the time of the request when omitted. Meta's attribution window is 7 days from click; events older than that lose attribution.

Contact phone number, digits only with no '+'. When used in lieu of conversationId, the handler resolves to the most recent CTWA-attributed conversation for this phone on the supplied account.

Stable customer identifier. Lowercased + SHA-256 hashed before sending to Meta.

Zernio Conversation _id (preferred lookup). The conversation must have a captured ctwa_clid in metadata (set automatically by the WhatsApp webhook on the first inbound message after a CTWA ad click).