We’re LitExtension - the world-leading shopping cart migration expert.
We will help you transfer Shopkeep gift cards to Shopify. We guarantee all your coupons will be migrated timely and accurately.
You can run the Free Demo (upto 500 entities) via LitExtension Store Migration app on Shopify App Store. Feel free to chat with us via LitExtension's website even when running the demo, we will support you dedicatedly.
I've never performed such a transfer. But about a year ago I've migrated my store to Shopify with the help of an automated tool Cart2Cart. I'm pretty happy with the migration outcome and my store works perfectly well. Maybe these guys will help you deal with your issue as well. As far as I know, they do all kinds of migrations and offer a bunch of extra services. So, I'd recommend you contact them directly and ask if they can offer any solution.