I'm trying to integrate revenuecat with the stripe checkout on my squarespace website - so that when a customer subscribes the subscription will be automatically applied. Following this document up untill point 5 "Send Stripe Token to RevenueCat" https://www.revenuecat.com/docs/stripe#:~:text=Connect with Stripe,in the RevenueCat Stripe App. Does anyone know where the cURL code is meant to be added on the Squarespace platform?