admin_post
Fires on an authenticated admin post request where no action is supplied.
WordPress File wp-admin/admin-post.php
admin_post_{$action}
Fires on an authenticated admin post request for the given action.
admin_post_nopriv
Fires on a non-authenticated admin post request where no action is supplied.
admin_post_nopriv_{$action}
Fires on a non-authenticated admin post request for the given action.