Issue #2983879: addUselessZeros error

src/Libs/SystempayHelper.php

@@ -146,7 +146,7 @@ class SystempayHelper {
     $output['link'] = $config_array['systempay_platform_url'];
     $output['fields']['vads_action_mode'] = 'INTERACTIVE';
     // Multiply the amount by 100 (Systempay requirement).
-    $output['fields']['vads_amount'] = $this->addUselessZeros($payment->getAmount() * 100);
+    $output['fields']['vads_amount'] = $this->addUselessZeros(strval($payment->getAmount() * 100));    
     $output['fields']['vads_capture_delay'] = $config_array['systempay_capture_delay'];
     $output['fields']['vads_ctx_mode'] = $config_array['systempay_ctx_mode'];
     $output['fields']['vads_currency'] = $payment->getCurrency()->getCurrencyNumber();