I can provide you with a sample code that can help you get started with creating a WordPress plugin that would automatically convert any Amazon.com links into links that use your affiliate code link. However, please note that the code is for illustrative purposes only, and you may need to modify it to meet your specific needs.

Here's a sample code that should work:

```php
<?php
/*
Plugin Name: Amazon Affiliate Links
Description: Converts all Amazon.com links to use your affiliate code.
Version: 1.0
Author: Your Name
*/

function amazon_affiliate_links( $content ) {
    $affiliate_id = 'YOUR_AFFILIATE_ID_HERE';
    $search_pattern = '/(?:https?:\/\/)?(?:www\.)?(?:amazon\.com\/)?([a-zA-Z0-9\/\-]+)(?:\?.*)?/';
    $replace_pattern = 'https://www.amazon.com/$1?tag=' . $affiliate_id;
    $content = preg_replace( $search_pattern, $replace_pattern, $content );
    return $content;
}
add_filter( 'the_content', 'amazon_affiliate_links' );
?>
```

To implement this plugin, you can follow these steps:

1. Create a new file in a text editor and paste the above code into it.
2. Replace "YOUR_AFFILIATE_ID_HERE" with your actual Amazon affiliate ID.
3. Save the file as "amazon-affiliate-links.php".
4. Compress the file into a ZIP archive.
5. Log in to your WordPress site and go to the "Plugins" page.
6. Click "Add New" and then "Upload Plugin".
7. Select the ZIP archive you created in step 4 and click "Install Now".
8. Once the plugin is installed, click "Activate Plugin".
9. Test the plugin by creating a new post with an Amazon.com link in it. The link should automatically be converted to use your affiliate code.
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