The main difference is in shipping profile management:
Wix V1: When you add products to your store, they are NOT automatically added to the Selfnamed shipping profile. You must manually add each product to your shipping profile in Selfnamed settings, or customers won't see shipping options at checkout.
Wix V3: When you add products to your store, they are automatically added to the Selfnamed shipping profile. No manual action needed – everything syncs automatically.
If you're unsure which version you're on, check your Wix dashboard or contact Selfnamed support.