Manage your PayPal integration settings
Log into PayPal Developer Dashboard
Go to developer.paypal.com
Navigate to My Apps & Credentials
Select the "Live" environment for production
Copy the Complete Client ID
The full Client ID should be approximately 80+ characters long
Update in Code
Replace the CLIENT_ID in src/components/PayPalButton.tsx
Look for the CLIENT_ID constant and replace with your complete PayPal Client ID