AWS Marketplace is an online store where you can buy or sell software that runs on Amazon Web Services (AWS).

User Guide
Explains how to use AWS Marketplace as a buyer to find, buy, and quickly deploy software that runs on Amazon Web Services (AWS). Also explains how to manage the sales channel for products you sell on AWS Marketplace and let people in your company manage subscriptions.
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AWS Marketplace Entitlement Service API Reference
The AWS Marketplace Entitlement Service is a contract verification feature that AWS Marketplace sellers can use to verify the amount of the seller’s product (for example, end user licenses or storage, data, or compute capacity) the customer has purchased. AWS Marketplace sellers can use this API to get information about what was purchased and when the purchased entitlement ends.
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  AWS Marketplace Metering Service API Reference
The AWS Marketplace Metering Service is a pricing and metering feature that AWS Marketplace sellers can use to directly charge for their software along one of four dimensions: users, data, bandwidth, or hosts. AWS Marketplace sellers can use this API to submit usage data for custom usage dimensions.
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