Hey @miracle,
You’ll want to make sure the Stripe Element (like any other element-driven plugin set) is visible on page load so Stripe’s functions are accessible to your application. Most Bubblers opt to enable the This element is visible on page load option for the Stripe Element and make it visible right away to make sure Stripe is properly initialized. Without proper initialization, functions like confirmCardPayment and other Stripe functions won’t be available for use to your application.
For the future, give us a shout at plugins@withcopilot.com so we can open a support ticket on your behalf. 