AWS Marketplace is an online store where you can buy or sell software that runs on Amazon Web Services (AWS). As a subscriber, you can find, buy, and quickly deploy software that runs on AWS. As a seller, you can manage the sales channel for products you sell.

Controlling Access to AWS Marketplace
Explains how to grant people within your organization the access they need to interact with AWS Marketplace.
  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.