See this tutorial: How to Create a 1-Click Upsell (Order Bump)
This tutorial is specific to Infusionsoft users who are using Infusionsoft’s ecommerce, NOT using AccessAlly’s Order Forms.
With AccessAlly, you can create a 1-click upsell IF you are using Infusionsoft as your CRM. This is advanced functionality, so please take the time to watch the tutorial video here:
The HTTP POST for the Charge Now function is: