w3specialists.com

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!

Modeewine

<h4>What is «Polylang Theme Strings» and what for is it?</h4>
This plugin gives additional features to the plugin Polylang. It automatically scans all templates files and scripts of the active WP theme (and all plugins) for available strings that can be translated. For example:
<ul>
<li><code>pll__('...');</code></li>
<li><code>pll_e('...');</code></li>
</ul>
and adds them to the Polylang registery, after what you can manage the translation of finded strings using the administration panel. It will make your life easier for the development of multilanguage’s projects, because you will not need to enter the needed strings to translate manually – the plugin will do all the work for you. 
Don’t forget that in the example are described the PHP-function calls, that is why they have to be inside of PHP-tags.
<h4>How works «Polylang Theme Strings»?</h4>
You have to install the plugins «Polylang» and «Polylang Theme Strings» on your multilanguage WordPress CMS project and they must be both active. When you are in the settings of plugin (Polylang) in the tab «Strings translation» the «Polylang Theme Strings» scans automatically the active theme of your project, find all the code strings that needed to be translated, adds them to the register, displays them on that page and gives to user the ability to translate these strings.
Like you can see, the «Polylang Theme Strings» is perfectly integrate with the «Polylang» plugin and works in automatically mode – it is comfortable, simple, and useful!
From version 4.0 «Polylang Theme Strings» got settings page where you can configure the search strings-translations more deeply.
Learn more in <a href="http://modeewine.com/en-polylang-theme-strings" rel="nofollow ugc">http://modeewine.com/en-polylang-theme-strings</a>.

Polylang Theme Strings

I think there is a bug and it is changing the site language to english.

Works fine

Automatic scanning of strings translation in the theme and registration of them in Polylang plugin. Extension for Polylang plugin.

W3S API Extension for Woocommerce vs Polylang Theme Strings