Amazon's product classification uses a specific node coding system called the Amazon Standard Classification Number (ASIN). ASIN is a unique identifier used to mark products in different categories on Amazon.

To find the Amazon classification node code, you can follow the steps below:

1. Visit the Amazon website (www.amazon.com) and log in to your account.

2. Enter the product keyword or category you are looking for in the search bar at the top of the homepage.

3. On the search results page, you can select filters and select a specific category.

4. Select the category you are interested in in the category filter and browse the list of related products.

5. Find the product you are interested in and click to enter the product's details page.

6. On the product details page, scroll down to the bottom of the product information and find the "ASIN" field in the "Product Information" section.

7. ASIN is the Amazon classification node code, usually a string of letters and numbers, similar to the format of "ABC123XYZ".

Please note that ASIN is a unique identifier for each product, not the code of the entire classification node. If you want to obtain the coding system or classification structure information of the entire classification node, you can refer to Amazon's developer documentation or contact Amazon's customer support team for more detailed information.