Create a product for wix. The currency for the price and the weight units, depend of your store configuration on wix.

There are 2 ways to add products to your inventory:

1. If it's a product that has no variants and it's only the product itself, you can use the 'quantity' attribute.
2. If your products have multiple variants (options to choose), you have to use the request 'variant update'. You can't use the 'quantity' attribute with products with variants, because it will have no effect.

For more information, check ecommerce documentation