Support Gen7

<script async
  src="https://js.stripe.com/v3/buy-button.js">
</script>

<stripe-buy-button
  buy-button-id="buy_btn_1U66EEJq0YZbjbi46TMwafv4"
  publishable-key="pk_live_51OMPavJq0YZbjbi4ICgBv6xy7WeY2IkhBqqc2EceefnbaZacz3f8YbC3DQaWshuHhlGFvYw2ERyjm7dP6IR4gAwx00OrEPYPcI"
>
</stripe-buy-button>