WooCommerce REST API Custom Fields

Question

Is it possible to access custom fields for orders, products, customers via WooCommerce REST API? If not natively, then what plugins or workarounds or hacks are out there that work? Thanks!

Answer 1

Answering my own question:

It is possible using the following: (using v3 legacy API)

To send custom fields back to the server: (For Orders)

{
  "order_meta": {
     "key": "value"
  }
}

To retrieve custom fields from server use this filter with your end point:

http://www.example.com/wc-api/v3/orders?filter[meta]=true

This works for Products as well.

Answer 2

As mentioned in the comment after WooCommerce creates an order via the API it will fire woocommerce_api_create_order hook, you can make use of it.

Add the following code to your theme's functions.php file

add_action( 'woocommerce_api_create_order', 'my_woocommerce_api_create_order', 10, 2);

function my_woocommerce_api_create_order( $order_id, $data ) {

     // $data contains the data was posted, add code to extract the required
     // fields and process it as required

}

Similarly look at the code in plugins/woocommerce/includes/api/*.php files, find the suitable action or filter hook for the end point and use it.