woo_rest_api.php

<?php

// Link example: https://mywebsite.com/wp-json (because we have woo, acf etc. that deploy their unique endpoints
function getWooCategories(string $link, string $consumer_key, string $consumer_secret)
{
    $curl = curl_init();

    curl_setopt_array($curl, [
        CURLOPT_URL => $link . '/wc/v3/products/categories?per_page=100&consumer_key=' . $consumer_key . '&consumer_secret=' . $consumer_secret,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_ENCODING => '',
        CURLOPT_MAXREDIRS => 10,
        CURLOPT_TIMEOUT => 0,
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
        CURLOPT_CUSTOMREQUEST => 'GET',
    ]);

    $response = curl_exec($curl);

    curl_close($curl);

    return json_decode($response, true);
}