How to call `gform_is_delayed_pre_process_feed` after payment in payment gateway gravity form plugin?

I developed a payment gateway plugin for gravity form. I want to update post when addon update post is active.

now I redirect customers to gateway and when they return to my callback function, I call gform_is_delayed_pre_process_feed` like this:

public static function Verify()
{

  add_filter("gform_is_delayed_pre_process_feed", true);

  //code
}

but add_filter doesn't work.

‌I call add_filter after payment in call function But add_filter didn't work.