...
The process to get the widget on the order confirmation page might vary a bit depending on where you’re installing ICS, but here are instructions for the most common ones:
Shopify Order Status Page
Shopify’s checkout page and order status page are some of the few reserved pages that don’t allow for full theme customization, so including the widget here requires an extra step beyond the regular installation detailed in Shopify Setup Guide (Beta Widget).
...
Now the widget will load with the specified campaign on the order confirmation page after a customer makes a purchase
TicketSocket Premiere
TicketSocket Premiere includes the ICS integration and is optimized for post-purchase campaigns already, only a few steps are needed to activate it:
...