During the onboarding process for the Modern Retail gift card integration with BigCommerce, your project manager or support team manager will ask you to confirm if you are utilizing a Headless BigCommerce site.
The Modern Retail gift card integration is compatible with default BigCommerce. Because of the custom development with a Headless site, compatibility with a Headless site requires additional billable discovery and (if approved) additional billable development work.
If you have questions regarding this work, please open a Support Ticket via your Admin Panel dashboard.