jetpack_forms_before_webhook_requestFilters the form data before sending it to the webhook. Allows developers to modify or augment the form data before it’s sent to the webhook endpoint. NOTE: data has to be the first argument so it can be defaulted.
jetpack_register_block_collectionShould all blocks get registered the Jetpack block collection in addition to their own categories?
jetpack_get_country_from_ipFilter to get country code from IP address.
jetpack_forms_hidden_field_valueFilter the value of the hidden field.
jetpack_forms_supported_integrationsFilters the list of supported integrations available in Jetpack Forms. Use this filter to add, modify, or remove integrations. Removing an integration here will prevent it from being returned by the REST integrations endpoints and from being displayed in the UI.
jetpack_forms_logAction when we want to log a jetpack_forms event.
woocommerce_analytics_experimental_proxy_tracking_enabledFilter to enable/disable experimental proxy tracking for WooCommerce Analytics
jetpack_og_default_site_imageDefine your own site’s representative image, to override any fallback image found by looking through site’s logo, site icon, and blavatar. This will allow you to overwrite the default fallback image generated dynamically.
jetpack_sitemap_suspend_cache_additionFilters whether to suspend cache addition for the entire sitemap generation.
Jetpack Developer Resources 