I’ve been considering using Printify , and I’d love to suggest it to my clients. Printify currently integrates with Shopify and WooCommerce… but y’all know I’d much prefer to have everything contained in my perfect Wix site!
Just puttin’ it out there.
Thanks for this #FeatureRequest 
This is a great feature request!
As a workaround, I believe you may be able to connect Printful to Wix as long as you use Ecwid as a third-party link between the two.
You can go here to learn how to connect your Ecwid store with your Printful account, then visit our App Market to add here the Ecwid Online Store.
Hope this helps! 