收到business team的邮件，不知道什么意思

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能不能帮我看下这两封邮件是什么意思，加入有什么好处吗，需要费用吗
第一封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.


第二封
Dear Seller,

We noticed that your products are relevant to business buyers. To expand your reach to business buyers, we invite you to join the Amazon Business Seller program.

Included at no additional cost as a part of the Professional Selling Plan, this program gives you access to exclusive benefits and features such as

Tiered referral fee for high value purchases in certain categories
Ability to enhance your seller profile for business buyers
Ability to upload enhanced product content such as user guides to your products
And more...
Join the program or learn more by clicking "Join Now" below.
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