Updates initCheckout to be synchronous
The stripe.initCheckout method is now synchronous instead of asynchronous. This breaking change affects you if your integration uses Elements with the Checkout Sessions API.
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| [Updates initCheckout to be synchronous](https://docs.stripe.com/changelog/clover/2025-09-30/update-init-checkout-synchronous.md) | Checkout, Elements | Breaking | stripejs |
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This breaking change affects you if your integration uses [Elements with the Checkout Sessions API](https://docs.stripe.com/payments/quickstart.md).
- The synchronous nature of initCheckout enables you to mount Elements earlier, which reduces the render latency of any Elements you mount immediately after initCheckout. This also enables Elements to display the skeleton loader UI after it’s mounted but the session state hasn’t fully loaded yet.
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