diff --git a/src/Controllers/Wallet.php b/src/Controllers/Wallet.php
index 89572c5..e425996 100644
--- a/src/Controllers/Wallet.php
+++ b/src/Controllers/Wallet.php
@@ -41,9 +41,9 @@ public function checkWalletBalance($userAuthorizationId, $amount, $currency, $pr
                 throw new ClientControllerException(false, "Invalid Direct Debit Product Type", 500);
             }
         }
-        $url = $this->api_url . $this->main()->GetEndpoint('WALLET_BALANCE');
+        $url = $this->api_url . $this->main()->GetEndpoint('WALLET_BALANCE') . '?' . http_build_query($data);
         $endpoint = '/v2' . $this->main()->GetEndpoint('WALLET_BALANCE');
-        $options = $this->HmacCallOpts('GET', $endpoint, 'application/json;charset=UTF-8;', $data);
+        $options = $this->HmacCallOpts('GET', $endpoint);
 
         return $this->doCall(true, "v2_checkWalletBalance", $url, [], $options);
     }