diff --git a/src/Frontend/InstallmentBuilder.php b/src/Frontend/InstallmentBuilder.php
index 909113a..d343467 100644
--- a/src/Frontend/InstallmentBuilder.php
+++ b/src/Frontend/InstallmentBuilder.php
@@ -340,7 +340,11 @@ public function getInstallmentPlanAsJson($amount, $type, $value)
     {
         $configuration = $this->getInstallmentCalculation($type, $value, $amount);
 
-        return json_encode($configuration->getResult());
+        $result = $configuration->getResult();
+        $rpReasonCodeTranslation = 'rp_reason_code_translation_' . $configuration->getReasonCode();
+        $result['responseText'] = $this->lang->$rpReasonCodeTranslation();
+
+        return json_encode($result);
     }
 
     /**