diff --git a/src/config/cashierConfig.ts b/src/config/cashierConfig.ts
index 6aa9633..c695b75 100644
--- a/src/config/cashierConfig.ts
+++ b/src/config/cashierConfig.ts
@@ -1,5 +1,35 @@
 import type { ICustomer, IRedirect } from '@/features/cashier/types';
 
+// Store parameters received via postMessage from parent window
+const postMessageParams: Record<string, string> = {};
+let postMessageCustomer: Partial<ICustomer> | null = null;
+
+// Initialize postMessage listener to receive params from parent window
+if (typeof window !== 'undefined' && window.parent !== window) {
+  window.addEventListener('message', (event: MessageEvent) => {
+    // Accept messages from any origin (parent window)
+    // In production, you might want to validate event.origin
+    if (event.data && typeof event.data === 'object') {
+      // If the message contains config params, store them
+      if (event.data.type === 'CASHIER_CONFIG' || !event.data.type) {
+        // Convert object to URLSearchParams-like format
+        Object.entries(event.data).forEach(([key, value]) => {
+          if (key === 'customer' && typeof value === 'object' && value !== null) {
+            // Handle customer object separately
+            postMessageCustomer = value as Partial<ICustomer>;
+          } else if (key !== 'type' && typeof value === 'string') {
+            postMessageParams[key] = value;
+          } else if (typeof value === 'number' || typeof value === 'boolean') {
+            postMessageParams[key] = String(value);
+          }
+        });
+        console.log('Received params via postMessage:', postMessageParams);
+        console.log('Received customer via postMessage:', postMessageCustomer);
+      }
+    }
+  });
+}
+
 export interface ICashierConfig {
   // Core payment configuration
   paymentType?: 'deposit' | 'withdrawal';
@@ -39,7 +69,25 @@ export interface ICashierConfig {
 }
 
 export function getCashierConfig(): ICashierConfig {
-  const params = new URLSearchParams(window.location.search);
+  const urlParams = new URLSearchParams(window.location.search);
+  
+  // Merge URL params with postMessage params (postMessage params take precedence)
+  const params = new URLSearchParams();
+  
+  // First add URL params
+  urlParams.forEach((value, key) => {
+    params.set(key, value);
+  });
+  
+  // Then override/add postMessage params
+  Object.entries(postMessageParams).forEach(([key, value]) => {
+    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()));
 
   const config: ICashierConfig = {
   };
@@ -63,13 +111,10 @@ export function getCashierConfig(): ICashierConfig {
   if (amount && amount !== 'undefined') {
     const parsedAmount = parseFloat(amount);
     if (!isNaN(parsedAmount)) {
-      config.amount = 200;
+      config.amount = parsedAmount;
     }
   }
 
-  // TODO: remove this default value
-  config.amount = 200;
-
   // Account from URL (for withdrawal)
   const account = params.get('account');
   if (account) {
@@ -86,8 +131,6 @@ export function getCashierConfig(): ICashierConfig {
   if (userId) {
     config.userId = userId;
   }
-  // TODO: remove this default value
-  config.userId = '12345';
 
 
   const sessionId = params.get('sessionId');
@@ -101,14 +144,28 @@ export function getCashierConfig(): ICashierConfig {
   }
 
   // Customer data from URL (support both new 'userId' and old 'customer_id' format)
-  const customer: Partial<ICustomer> = {};
-  // TODO: remove this default value
-  const customerId =
-    //  params.get('customer_id') || userId ||
-    '12345';
-
+  // Start with postMessage customer if available, otherwise create new object
+  const customer: Partial<ICustomer> = postMessageCustomer ? { ...postMessageCustomer } : {};
+  
+  const customerId = params.get('customer_id') || userId;
   if (customerId) customer.id = customerId;
 
+  // Parse additional customer fields from URL params (only if not already set from postMessage)
+  if (!customer.first_name) {
+    const firstName = params.get('customer_first_name') || params.get('first_name');
+    if (firstName) customer.first_name = firstName;
+  }
+
+  if (!customer.last_name) {
+    const lastName = params.get('customer_last_name') || params.get('last_name');
+    if (lastName) customer.last_name = lastName;
+  }
+
+  if (!customer.email) {
+    const email = params.get('customer_email') || params.get('email');
+    if (email) customer.email = email;
+  }
+
   if (Object.keys(customer).length > 0) {
     config.customer = customer;
   }