diff --git a/includes/class-wc-gateway-komoju-single-slug.php b/includes/class-wc-gateway-komoju-single-slug.php
index 52f9196..ab13a02 100644
--- a/includes/class-wc-gateway-komoju-single-slug.php
+++ b/includes/class-wc-gateway-komoju-single-slug.php
@@ -131,14 +131,14 @@ public function create_session_for_fields()
     {
         $komoju_api     = $this->komoju_api;
         $currency       = get_woocommerce_currency();
-        $orderTotal = 0;
+        $order_total = 0;
 
         if (WC()->cart) {
-            $orderTotal = $this->get_order_total();
+            $order_total = $this->get_order_total();
         }
 
         $session_params = [
-            'amount'         => self::to_cents($orderTotal, $currency),
+            'amount'         => self::to_cents($order_total, $currency),
             'currency'       => $currency,
             'default_locale' => self::get_locale_or_fallback(),
             'metadata'       => [
@@ -146,7 +146,7 @@ public function create_session_for_fields()
             ],
         ];
 
-        if ($orderTotal == 0) {
+        if ($order_total == 0) {
             return null;
         }