Here's an example of the PHP code that you can use to create a WordPress plugin that will automatically convert any Amazon.com links into links that use your affiliate code:
```php
<?php
/*
Plugin Name: Amazon Affiliate Link Converter
Description: Automatically converts Amazon.com links to affiliate links.
Version: 1.0
Author: Your Name
Author URI: Your Website
*/

function convert_amazon_links($content) {
  $amazon_affiliate_id = 'YOUR_AFFILIATE_ID_HERE';
  $amazon_regex = '/https?:\/\/(www\.)?amazon\.com(\/(\w{2}\/)?(dp|gp\/product)\/(\w+))?/';
  $content = preg_replace($amazon_regex, "https://www.amazon.com/dp/$5/?tag=$amazon_affiliate_id", $content);
  return $content;
}

add_filter('the_content', 'convert_amazon_links');
```

Here's how you can implement this plugin:

1. Create a new file in your WordPress plugins directory (usually wp-content/plugins) and name it something like amazon-affiliate-link-converter.php.
2. Copy the code above and paste it into your new file.
3. Replace YOUR_AFFILIATE_ID_HERE with your actual Amazon affiliate ID.
4. Save the file and upload it to your WordPress plugins directory.
5. Log in to your WordPress admin panel and activate the plugin.

That's it! Your plugin is now active and will automatically convert any Amazon.com links in your website's content to affiliate links using your Amazon affiliate ID. Note that this plugin will only work for links that use the https://www.amazon.com/dp/ or https://www.amazon.com/gp/product/ URL structure. If you want to convert links that use a different URL structure, you will need to modify the regular expression in the code accordingly.
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