Yes and no.... We don't have an automatic integration with Wix commerce/checkout (as they have not allowed us to develop this integration/app as it competed with their own, poor quality gift card app!), but we do have a way to get Gift Up! and Wix commerce/checkout to work together.
They do offer their own gift card solution available on the eCommerce / VIP plan, but their gift cards can only be used offline. They are also limited in terms of capability compared to what we offer. But we do have a solution for you... read on...
How to accept Gift Up! gift cards on your Wix website
We also have a way that you can employ right now to accept our gift cards in your Wix store.