You can verify your affiliate links using Amazon Link Checker, the free tool available in Amazon Associate dashboard.
1. Create a widget via Super dashboard.
2. Embed the widget on your site.
3. Click on any product in the widget in your site.
4. The Amazon product page which opens in a new tab will have ?tag=yourAmazonTag-20 in the URL - this means your associate tracking ID is embedded in the link and your will get credit for the sale.
4. Put the entire Amazon URL in the Amazon link checker. It will tell you whether the link is valid with your tracking ID.