Within your email autoresponder template body, you must use the {$productlist} token, and when adding the upsell transaction through the API, you must send the same OrderID created when creating a sale transaction. The OrderID is not the same as the CustomerID. Refer to the API Guide on adding an upsell transaction.
How to Set Up Single Email Order Confirmations
Click Go to E-commerce.
Go to CRM > Autoresponders > Templates in the main navigation.
Click New to create a new template, or click the edit icon (pencil) next to an existing template to edit it.
In the email body, insert the {$productlist} token where you want the product list to appear.
Optionally, click Preview to verify how the email will look (available in HTML mode only).
Click Save.
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