Set a Google Maps API Key.
jetpack_google_maps_api_key
jetpack_google_maps_api_key-
filter jetpack_photon_development_modeDisables Photon URL processing for local development
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filter jetpack_skip_usuable_domain_checkSkips the usuable domain check when connecting a site. Allows site administrators with domains that fail gethostname-based checks to pass the request to WP.com
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action jetpack_unlinked_userFires after the current user has been unlinked from WordPress.com.
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filter sites_site_formatFilter the structure of information about the site to return.
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action jetpack_pre_theme_upgradePre-upgrade action
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action jetpack_pre_core_upgradePre-upgrade action
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action jetpack_pre_plugin_upgradePre-upgrade action
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filter site_settings_endpoint_update_{$key}Filter current site setting value to be updated.
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filter site_settings_endpoint_getFilter the current site setting in the returned response.
Jetpack Developer Resources 