Based on the information I have, Vapi is designed to be integrated with other platforms and can be used to build voice AI agents that perform actions like making calls. This means it is generally possible to set up a workflow where, when an order comes in through Shopify, Vapi could be triggered to call the lead for confirmation. However, I don't have specific details or step-by-step instructions on how to connect Shopify to Vapi or how to configure the trigger for this use case.