To redirect customer to ShopeePay app, use the URL (deeplink/web_url) retrieved from post data transaction API response. Then customer can be redirected via server-side redirect, using javascript like window.location=[deeplink], or using an HTML link <a href="[web_url]">Pay with ShopeePay</a>.
3. Callback/Return URL
After the customer completes the payment via ShopeePay's apps, Faspay automatically redirect customer to callback/return URL. Please provide the URL and make sure it's already registered on Faspay system. For the detailed reference can be found Here
4. Payment Notification
Payment notification from Faspay to Merchant backend will also be triggered in event of transaction status getting updated, to ensure merchant is securely informed. Please provide the URL and make sure it's already registered on Faspay system