Amazon Custom program是什么？收到了“Amazon Custom Invitation”邮件

“Dear Seller,
Amazon Custom is a new program with the goal of delivering new, user-friendly features for Sellers that wish to offer personalized or customizable products to Amazon shoppers. We’re currently reaching out to Sellers who may offer text or image-based customization on their products to pilot the first version of these features.
If you’re interested in participating, please complete the online application by clicking the button below. 
If your account is approved, you’ll be able to start listing products that customers can add their own text and photos to, which you use to personalize and fulfill their order.”
我想问Amazon Custom是什么？