wp_ajax_upsell_nudge_jitm

See hook in action

See this hook used in plugins:

Select Pluginjetpack.11.0jetpack.11.1jetpack.11.1.2jetpack.11.2jetpack.11.3.1jetpack.11.3.2jetpack.11.4jetpack.11.5.1jetpack.11.6jetpack.11.8jetpack.11.8.4jetpack.11.9jetpack.11.9.1jetpack.12.0jetpack.12.1jetpack.12.1.1jetpack.12.2.1jetpack.12.3jetpack.12.5jetpack.12.6jetpack.12.6.1jetpack.12.7.1jetpack.12.8jetpack.12.8.1jetpack.12.9jetpack.12.9.3jetpack.13.0jetpack.13.1.1jetpack.13.1.3jetpack.13.2jetpack.13.2.1