Sure, here's an example of how you can create a WordPress plugin that automatically converts any Amazon.com links into links that use your affiliate code.

First, you'll need to create a new PHP file called "amazon-affiliate-plugin.php" and save it in a new folder in your WordPress plugin directory.

Next, you'll need to add the following code to the top of your PHP file to create a new WordPress plugin:
```php
<?php
/*
Plugin Name: Amazon Affiliate Plugin
Plugin URI: https://www.example.com/
Description: Automatically converts Amazon links into affiliate links.
Version: 1.0
Author: Your Name
Author URI: https://www.example.com/
License: GPL2
*/

// Your plugin code goes here
```

Now, you can add the code that will convert the Amazon links into affiliate links. Here's an example of how you can do that:
```php
function convert_amazon_links($content) {
    $affiliate_code = "YOUR_AFFILIATE_CODE_HERE";
    $new_content = str_replace("https://www.amazon.com", "https://www.amazon.com/?tag=$affiliate_code", $content);
    return $new_content;
}
add_filter('the_content', 'convert_amazon_links');
```
This code uses the WordPress filter the_content to modify the content of each post and page on your site. It replaces any instances of "https://www.amazon.com" with "https://www.amazon.com/?tag=YOUR_AFFILIATE_CODE_HERE". This will automatically add your affiliate code to any Amazon links on your site.

Finally, you can save the file and activate the plugin in your WordPress admin dashboard. Once activated, any Amazon links on your site will automatically use your affiliate code.
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