/**
  * @param Request $request
  * @param StoreEntity $store
  * @return string
  * @throws InvalidShopifyHmac
  */
 public function verifyWebhookRequest(Request $request, StoreEntity $store)
 {
     $hmac_header = $request->headers->get('X_SHOPIFY_HMAC_SHA256');
     $calculated_hmac = base64_encode(hash_hmac('sha256', $request->getContent(), $store->getShopifySecretToken(), true));
     if ($hmac_header != $calculated_hmac) {
         throw new InvalidShopifyHmac();
     }
     return $calculated_hmac;
 }