Comment by jenanwise

We found that legacy version of Checkout did not allow us to build a number of features that users have been asking about for years—including instantly turning on Apple Pay without needing you to register with Apple directly, supporting a unified API that can work with redirect-based payment methods such as iDEAL (coming soon), and a bunch more features that we're working on. If you're looking for something embedded in your page, we have Elements: https://stripe.com/docs/stripe-js/elements/quickstart