Products are now put in a category. The commission will be based on the category each product has been placed in whether or not the category is correct. For instance, I had a sale for a child riding toy tractor. Instead of it being in toys category which would have only earned me 3%, it was actually placed in lawn and garden category which I then actually earned 8% instead.
The easiest thing to do is to sign up for an affiliate marketing network like Commission Junction. They provide a marketplace where your affiliate program will be advertised to other affiliate marketers. They also provide the tracking software for your affiliates so you don’t have to build your own tracking system. In some ways this is better because it takes care of the trust issues. Affiliates are always suspicious of whether or not they’re getting credited for the sales they generate. By having an intermediary take care of transaction tracking and payments, the fear of being cheated is alleviated. 

Until 2017, Amazon offered a stepped commission structure so that affiliates who sold a lot of products were paid a higher commission than those who sold little. However, Amazon eliminated this structure and began using flat commission rates for different types of products. While this is likely to continue evolving, examples of the commission structure in 2018 are as follow:
As digital marketing continues to grow and develop, brands take great advantage of using technology and the Internet as a successful way to communicate with its clients and allows them to increase the reach of who they can interact with and how they go about doing so,.[2] There are however disadvantages that are not commonly looked into due to how much a business relies on it. It is important for marketers to take into consideration both advantages and disadvantages of digital marketing when considering their marketing strategy and business goals.
(k) If you display Product Advertising Content consisting of text on your application, you will include the following disclaimer in plain view to end users of your application: “CERTAIN CONTENT THAT APPEARS [IN THIS APPLICATION or ON THIS SITE, as applicable] COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.” You agree to provide us with any information that we request to verify your compliance with this License.
(g) You will not offer any person or entity any consideration, reward, or incentive (including any money, rebate, discount, points, donation to charity or other organization, or other benefit) for using Special Links. For example, you cannot implement any “rewards” or loyalty program that incentivizes persons or entities to visit an Amazon Site via your Special Links.
In 2006, the most active sectors for affiliate marketing were the adult gambling, retail industries and file-sharing services.[21]:149–150 The three sectors expected to experience the greatest growth are the mobile phone, finance, and travel sectors.[21] Soon after these sectors came the entertainment (particularly gaming) and Internet-related services (particularly broadband) sectors. Also several of the affiliate solution providers expect to see increased interest from business-to-business marketers and advertisers in using affiliate marketing as part of their mix.[21]:149–150
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