wp_ajax_jetpack_wizard_banner

See hook in action

See this hook used in plugins:

Select Pluginjetpack.8.6jetpack.8.6.1jetpack.8.8jetpack.8.8.1jetpack.8.8.2jetpack.8.9jetpack.8.9.1jetpack.9.0.1jetpack.9.0.2jetpack.9.1jetpack.9.2jetpack.9.2.1jetpack.9.3jetpack.9.3.1jetpack.9.4