Connecting to Unleashed API via Woocommerce - api

Question

I'm trying to connect Woocommerce to Unleashed and have the code for it below. It consistently fails authorisation. It requires a HMAC-SHA256 signature to be generated.
add_action('init', 'register_product');
function register_product(){
register_post_type('product', [
'label' => 'Products Greyville',
'public' => true,
'capability_type' => 'post'
]);
}
function get_products_from_unleashed(){
$current_page = ( ! empty($_POST['current_page']) ) ? $_POST['current_page'] : 1;
$products = [];
$results = wp_remote_get('https://api.unleashedsoftware.com/products/?page=' . $current_page . '&per_page=50');
}
$apiId = "***";
$apiKey = "***";
function getSignature($request, $key) {
return base64_encode(hash_hmac('sha256', $request, $key, true));
}
function getCurl($id, $key, $signature, $endpoint, $requestUrl, $format) {
global $api;
$curl = curl_init($api . $endpoint . $requestUrl);
curl_setopt($curl, CURLOPT_FRESH_CONNECT, true);
curl_setopt($curl, CURLINFO_HEADER_OUT, true);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
"Content-Type: application/$format",
"Accept: application/$format",
"api-auth-id: $id",
"api-auth-signature: $signature"));
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_TIMEOUT, 20);
// these options allow us to read the error message sent by the API
curl_setopt($curl, CURLOPT_FAILONERROR, false);
curl_setopt($curl, CURLOPT_HTTP200ALIASES, range(400, 599));
return $curl;
}
function get($id, $key, $endpoint, $request, $format) {
$requestUrl = "";
if (!empty($request)) $requestUrl = "?$request";
try {
// calculate API signature
$signature = getSignature($request, $key);
// create the curl object
$curl = getCurl($id, $key, $signature, $endpoint, $requestUrl, $format);
// GET something
$curl_result = curl_exec($curl);
error_log($curl_result);
curl_close($curl);
return $curl_result;
}
catch (Exception $e) {
error_log('Error: ' + $e);
}
}
Please also see: https://apidocs.unleashedsoftware.com/PHP
And: https://apidocs.unleashedsoftware.com/AuthenticationHelp