diff --git a/src/config/cashierConfig.ts b/src/config/cashierConfig.ts
index 6cc4faf..097e0f3 100644
--- a/src/config/cashierConfig.ts
+++ b/src/config/cashierConfig.ts
@@ -1,5 +1,7 @@
 import type { ICustomer, IRedirect } from '@/features/cashier/types';
 
+const CASHIER_CONFIG_STORAGE_KEY = 'cashier_config';
+
 // Store parameters received via postMessage from parent window
 const postMessageParams: Record<string, string> = {};
 let postMessageCustomer: Partial<ICustomer> | null = null;
@@ -88,12 +90,20 @@ export function getCashierConfig(): ICashierConfig {
     params.set(key, value);
   });
 
-  // Debug: Log all parameters (URL + postMessage)
-  console.log('All URL params:', Object.fromEntries(urlParams.entries()));
-  console.log('All postMessage params:', postMessageParams);
-  console.log('Merged params:', Object.fromEntries(params.entries()));
+  let storedConfig: Partial<ICashierConfig> = {};
+  if (typeof window !== 'undefined') {
+    try {
+      const stored = window.sessionStorage.getItem(CASHIER_CONFIG_STORAGE_KEY);
+      if (stored) {
+        storedConfig = JSON.parse(stored) as Partial<ICashierConfig>;
+      }
+    } catch {
+      // Ignore storage parsing errors and fall back to fresh config
+    }
+  }
 
   const config: ICashierConfig = {
+    ...storedConfig,
   };
 
   // Payment type from URL (support both 'method' and 'payment_type' for backward compatibility)
@@ -152,8 +162,12 @@ export function getCashierConfig(): ICashierConfig {
   }
 
   // Customer data from URL (support both new 'userId' and old 'customer_id' format)
-  // Start with postMessage customer if available, otherwise create new object
-  const customer: Partial<ICustomer> = postMessageCustomer ? { ...postMessageCustomer } : {};
+  // Start with postMessage customer if available, otherwise fall back to stored customer
+  const customer: Partial<ICustomer> = postMessageCustomer
+    ? { ...postMessageCustomer }
+    : storedConfig.customer
+    ? { ...storedConfig.customer }
+    : {};
   
   const customerId = params.get('customer_id')?.trim() || userId;
   if (customerId) {
@@ -184,7 +198,7 @@ export function getCashierConfig(): ICashierConfig {
   }
 
   // Redirect URLs from URL
-  const redirect: Partial<IRedirect> = {};
+  const redirect: Partial<IRedirect> = config.redirect ? { ...config.redirect } : {};
   const successUrl = params.get('redirect_success');
   const cancelUrl = params.get('redirect_cancel');
   const errorUrl = params.get('redirect_error');
@@ -251,7 +265,7 @@ export function getCashierConfig(): ICashierConfig {
   }
 
   // Attributes (handle attributes.* parameters)
-  const attributes: Record<string, unknown> = {};
+  const attributes: Record<string, unknown> = config.attributes ? { ...config.attributes } : {};
   params.forEach((value, key) => {
     if (key.startsWith('attributes.')) {
       const attrKey = key.replace('attributes.', '');
@@ -263,6 +277,14 @@ export function getCashierConfig(): ICashierConfig {
     config.attributes = attributes;
   }
 
+  if (typeof window !== 'undefined') {
+    try {
+      window.sessionStorage.setItem(CASHIER_CONFIG_STORAGE_KEY, JSON.stringify(config));
+    } catch {
+      // Ignore storage errors (e.g. quota exceeded) and continue without persistence
+    }
+  }
+
   return config;
 }