Create an embedded Checkout instance stripe.createEmbeddedCheckoutPage(options: object) This method creates an embedded Checkout instance. - options Embedded Checkout create options. - fetchClientSecret A callback function `fetchClientSecret() => Promise
that resolves with the [client secret](https://docs.stripe.com/api/checkout/sessions/object.md#checkout_session_object-client_secret) for the [Checkout Session](the relevant part of the product). -clientSecret (deprecated)_This param has been deprecated in favor of thefetchClientSecretparam, which offers a faster loading experience._ The [client secret](https://docs.stripe.com/api/checkout/sessions/object.md#checkout_session_object-client_secret) for the [Checkout Session](the relevant part of the product). -onCompleteAn optional callback functiononComplete() => voidthat is called on completion for Checkout Sessions withredirect_on_completion: if_required`. ### Example title Create embedded Checkout instance