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Enhances your store’s REST API by adding powerful, flexible endpoints. 
Stay tuned more are coming!
Add or Remove a Single Category
Easily append or remove one category at a time—by numeric ID or human-friendly slug—using simple POST/PUT/PATCH or DELETE requests to 
 /wp-json/wc/v3/products/{product_id}/categories/{identifier}
Batch Manage Multiple Categories
In a single call, add or remove multiple categories at once via JSON payloads to 
 /wp-json/wc/v3/products/{product_id}/categories 
Supply an array of IDs or slugs under the “categories” key to update your product’s category list in bulk.
Automatic Slug Resolution 
Pass slugs like “summer-collection” and the plugin will resolve them to the correct WooCommerce term IDs on the fly—no extra lookups required.
Non-Destructive Updates 
Neither endpoint touches other product data. Categories are merged or pruned transparently without overwriting prices, stock, attributes, or any other fields.
Built-In Validation & Security
Sanitization of all inputs (IDs and slugs) to guard against bad data.
Permission checks ensure only users with the edit_products capability (Shop Manager, Admin) can modify categories.
Clear, standardized error codes (w3s_api_extension_invalid_product and w3s_api_extension_invalid_product_category) for consistent API responses.
W3S API Extension for WooCommerce installs alongside the core WooCommerce REST API, requires no additional configuration, and works out of the box.
<h3>Endpoints Documentation</h3>
Product Categories
<ul>
<li>
 Add a single category
<ul>
<li>Type: HTTP request</li>
<li>Endpoint: `/wp-json/wc/v3/products/{product_id}/categories/{identifier}`</li>
<li>Methods: POST, PUT, PATCH</li>
<li>Examples: 
 curl -X PUT https://example.com/wp-json/wc/v3/products/125/categories/18 \ 
 -u consumer_key:consumer_secret 
 curl -X PUT https://example.com/wp-json/wc/v3/products/125/categories/my-category \ 
 -u consumer_key:consumer_secret
 </li>
</ul>
</li>
<li>
 Remove a single category
<ul>
<li>Type: HTTP request</li>
<li>Endpoint: `/wp-json/wc/v3/products/{product_id}/categories/{identifier}`</li>
<li>Methods: DELETE</li>
<li>Examples: 
 curl -X DELETE https://example.com/wp-json/wc/v3/products/125/categories/18 \ 
 -u consumer_key:consumer_secret 
 curl -X DELETE https://example.com/wp-json/wc/v3/products/125/categories/my-category \ 
 -u consumer_key:consumer_secret
 </li>
</ul>
</li>
<li>
 Batch add categories
<ul>
<li>Type: HTTP request</li>
<li>Endpoint: `/wp-json/wc/v3/products/{product_id}/categories`</li>
<li>Methods: POST, PUT, PATCH</li>
<li>Example: 
 curl -X PUT https://example.com/wp-json/wc/v3/products/125/categories \ 
 -u consumer_key:consumer_secret \ 
 -H “Content-Type: application/json” \ 
 -d ‘{“categories”: [1,”my-category”,3,”my-category-1″]}’
 </li>
</ul>
</li>
<li>
 Batch delete categories
<ul>
<li>Type: HTTP request</li>
<li>Endpoint: `/wp-json/wc/v3/products/{product_id}/categories`</li>
<li>Methods: DELETE</li>
<li>Example: 
 curl -X DELETE https://example.com/wp-json/wc/v3/products/125/categories \ 
 -u consumer_key:consumer_secret \ 
 -H “Content-Type: application/json” \ 
 -d ‘{“categories”: [1,”my-category”,3,”my-category-1″]}’
 </li>
</ul>
</li>
</ul>
Extra notes
<ul>
<li> The single category endpoint doesn’t allow slug with characters anything other than latin & numbers [a-z0-9] </li>
<li> Strings that include only numbers will be parsed as IDs and not as Slugs</li>
</ul>

W3S API Extension for Woocommerce

Enhances your store’s REST API by adding powerful, flexible endpoints. Stay tuned more Endpoints are coming!

eSparkBiz

<ul>
<li>
This plugin will allow you to add extensions to WordPress url as per your preference.
</li>
<li>
It is compatible for any WordPress site.
</li>
<li>Append any extension to your WordPress url. Like .html, .php, .jsp, .xml, etc.</li>
<li>Append any extension to your WordPress Post and Page URL..</li>
</ul>

ESB URL Extension

This plugin will allow you to add extensions to WordPress url as per your preference.

W3S API Extension for Woocommerce vs ESB URL Extension