diff --git a/src/Message/CompletePurchaseResponse.php b/src/Message/CompletePurchaseResponse.php
index 33a908b..28d8ebc 100644
--- a/src/Message/CompletePurchaseResponse.php
+++ b/src/Message/CompletePurchaseResponse.php
@@ -51,8 +51,7 @@ public function getCustomFields()
     {
         $fields = array_filter([
             'Shp_TransactionId' => $this->getTransactionId(),
-            'Shp_Client' => $this->getClient(),
-            'Shp_Currency' => $this->getCurrency(),
+            'Shp_Client' => $this->getClient()
         ]);
 
         ksort($fields);
@@ -87,7 +86,7 @@ public function getTransactionId()
 
     public function getCurrency()
     {
-        return $this->data['Shp_Currency'];
+        return $this->data['OutSumCurrency'] ?? '';
     }
 
     /**
diff --git a/src/Message/PurchaseRequest.php b/src/Message/PurchaseRequest.php
index d7337c1..bb66467 100644
--- a/src/Message/PurchaseRequest.php
+++ b/src/Message/PurchaseRequest.php
@@ -20,9 +20,9 @@ public function getData()
 
         return [
             'InvId' => $this->getInvId(),
-            'MrchLogin' => $this->getPurse(),
+            'MerchantLogin' => $this->getPurse(),
             'OutSum' => $this->getAmount(),
-            'Desc' => $this->getDescription(),
+            'Description' => $this->getDescription(),
             'IncCurrLabel' => $this->getCurrencyLabel(),
             'OutSumCurrency' => $this->getCurrency(),
             'SignatureValue' => $this->generateSignature(),
@@ -57,8 +57,7 @@ public function getCustomFields()
     {
         $fields = array_filter([
             'Shp_TransactionId' => $this->getTransactionId(),
-            'Shp_Client' => $this->getClient(),
-            'Shp_Currency' => $this->getCurrency()
+            'Shp_Client' => $this->getClient()
         ]);
 
         ksort($fields);