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Use the External page type on the funnel visualizer and set the External URL in the page settings.
When the customer is redirected to the upsell page, the orderId will be added to the URL string. Configure your affirmative “Yes” button on the upsell page to trigger the Import Upsell API request. Be sure to pass the orderId received from Checkout Champ to add the purchase to the original orderId. You can send the customers to as many upsell pages as you see fit by continuing to call the Import Upsell API.
When the customer reaches the external Thank You page, you can call the Confirm Order API to send the customer’s order confirmation email immediately.
You can apply the same method to redirect from a Checkout Champ checkout page to an external Thank You page. This will pass the order ID on the URL string, you can utilize the Order Query API to retrieve all associated parameters by using the passed Order ID.