coderlift

As an affiliate of Amazon, you must have to show a disclaimer message. It is tough to put this message for each post. This plugin solves this problem and makes the automation of showing affiliate disclaimer message before the post which has the link of any affiliate site like Amazon or eBay. 
<a href="https://coderlift.com/coderlift-affiliate-compliance/" title="Plugin Details" rel="nofollow ugc">Visit plugin details page</a>
<h3>How to setup:</h3>
After installing the plugin you will get a settings page from admin panel: 
Dashboard -> Settings -> CL Affiliate Compliance
You will get 2 input fields.
=> Targeted Words To Be Filtered 
Put words by which you want to filter the links of the post contents. It means if the words provided here will found in any link of the contents the disclaimer message will appear.
You can put multiple words separating by a comma.
Example: If you need to show the disclaimer message if in your post have a link from amazon, just put ‘amazon’ in this box.
=> Compliance Content Before Post: 
This is the place where your disclaimer message will show. 
You can use any plain text, image, link, or any HTML here.

Coderlift Affiliate Compliance

This plugin automatically tracks the affiliate links from your post contents and shows a disclaimer message if links found.

WPExplorer

This plugin is an <a href="https://www.wpexplorer.com/best-woocommerce-extensions/" rel="nofollow ugc">addon for WooCommerce</a> which adds a new tab in the <a href="https://docs.woocommerce.com/document/woocommerce-customizer/" rel="nofollow ugc">Customizer Panel</a> so you can enter a custom affiliate disclosure text on your WooCommerce products.
You can enable the disclosure so it only displays on affiliate/external products or on all products. You can also select your placement from several available WooCommerce hooks (before button form, after button form, before button, after button, product meta start or productmeta end), alter the default font size and top/bottom padding.
<h4>Disclaimer</h4>
WPExplorer is not affiliated with WooCommerce, WooThemes, or Automattic. This plugin is provided as a free resource to the WordPress community. We are not lawyers and can not provide legal advice regarding proper site/product disclosures. It is your responsability to ensure you are following proper FTC guidelines.

Affiliate Disclosure for WooCommerce

Display a custom disclosure text on your WooCommerce external/affiliate (or all) products.

Coderlift Affiliate Compliance vs Affiliate Disclosure for WooCommerce