one of our developers has been working on a custom off site payment method with First Data Card Point Hosted Payment pages (not gge4 gateway). we are almost complete and purchased this support license so we can finish this project. https://github.com/eventespresso/event-espresso-core/issues/3317#issuecomment-782204020
here is the latest correspondence between our developer and yours. Thank you so much – excited to complete this and add a number of the great features that come with this license.