PHP hash_hmac to JS Hmac

Im trying to verify a webhook signature, I have this PHP code from the documentation of api2cart but I need it in Javascript.I tried however I couldn't match the signature and the HMAC generated value, more details here

steps to follow in the link above

$headersForJson = [
'X-Webhook-Error-Code' => '0',
'X-Webhook-Action' => 'update',

'X-Webhook-Timestamp' => '1516291592',

'X-Webhook-Entity' => 'product',

'X-Webhook-Store-Id' => '1',

'X-Webhook-Signature' => 'SGVsbG8gd2l0aCBBUEkyQ2FydA==',

];

$signatureFromRequest = $headersForJson['X-Webhook-Signature'];

unset($headersForJson['X-Webhook-Signature']);

ksort($headersForJson);

$headers = json_encode($headersForJson);

$data = $headers . $params['raw_body'];

$generatedSignature = base64_encode(hash_hmac('sha256', $data, $storeKey, true));

 if (hash_equals($signatureFromRequest, $generatedSignature)) {
   return true;
 }

Here is what I did:

const signature = headers['x-webhook-signature'];
delete headers['x-webhook-signature'];
    // the header contained other keys I had to get keys starting with x-webhooks
    let xkeys = Object.keys(headers).filter(key => key.includes('x-webhook-')).sort();
    let xheaders = JSON.stringify(xkeys.reduce((res, key) => Object.assign(res, { [key]: headers[key] }), {}));
    let data = xheaders + rawBody


const generatedHash = createHmac('SHA256', "SecretKey")
            .update(data, 'utf-8')
            .digest('base64');


return generatedHash === signature

what am I missing here ?

source https://stackoverflow.com/questions/67941788/php-hash-hmac-to-js-hmac