In Product overview > Add Button & Variants
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When product is sold out it will show, You can disable /enable Waitlist
From your Shopify admin, go to Settings -> Custom data
Click Products → Add Definition.
Please enter correct Namespace and Key as we noted below.
From your Shopify admin, go to Products -> All products.
Find and choose the product that you want to edit.
In the Metafields, please insert content for "Affiliate" field.