Parameters

Updated: Jun 30, 2026

This page groups the Conversions API parameters by family, covering the required event data parameters and the additional parameters that support ads attribution and ads delivery optimization.

The Conversions API now supports web, app, offline, and business messaging events.

Website events shared using the Conversions API require the client_user_agent, action_source, and event_source_url parameters, while non-web events require only action_source. These parameters contribute to improving the quality of events used for ad delivery and may improve campaign performance.

By using the Conversions API, you agree that the action_source parameter is accurate to the best of your knowledge.

Main Body Parameters

• data
• test_event_code

Customer information parameters

• em: Email — Hashing required
• ph: Phone Number — Hashing required
• fn: First Name — Hashing required
• ln: Last Name — Hashing required
• ge: Gender — Hashing required
• db: Date of Birth — Hashing required
• ct: City — Hashing required
• st: State — Hashing required
• zp: Zip Code — Hashing required
• country: Country — Hashing required
• external_id: External ID — Hashing recommended
• client_ip_address: Client IP Address — Do not hash
• client_user_agent: Client User Agent — Do not hash
• fbc: Click ID — Do not hash
• fbp: Browser ID — Do not hash
• subscription_id: Subscription ID — Do not hash
• fb_login_id: Facebook Login ID — Do not hash
• lead_id: Lead ID — Do not hash
• anon_id: Install ID — Do not hash (Note: This parameter is for app events only)
• madid: Mobile Advertiser ID — Do not hash (Note: This parameter is for app events only)
• page_id: Page ID — Do not hash
• page_scoped_user_id: Page scoped user ID — Do not hash
• ctwa_clid: Click to WhatsApp ID — Do not hash
• ig_account_id: IG account ID — Do not hash
• ig_sid: Click to Instagram ID — Do not hash

Server Event Parameters

• event_name
• event_time
• user_data
• custom_data
• event_source_url
• opt_out
• event_id
• action_source
• data_processing_options
• data_processing_options_country
• data_processing_options_state
• referrer_url
• customer_segmentation

App data parameters

• advertiser_tracking_enabled
• application_tracking_enabled
• extinfo
• campaign_ids
• install_referrer
• installer_package
• url_schemes
• windows_attribution_id
• anon_id
• madid
• vendor_id

Note: See the Conversions API for App Events documentation for guidance on integrating app events.

Standard parameters

See a list of all standard parameters users can send to Meta.

Original event data parameters

• event_name
• event_time
• order_id
• event_id

Conversions API for lead optimization

If you integrate your CRM system with the Conversions API for lead events, refer to the CRM Integration guide for the required fields.

See also

• Overview: fbp and fbc Parameters

Learn more

• Conversions API: Documentation
• Using the Conversions API
• Meta Privacy and Data Use Guide⁠