Squarespace is a popular e-commerce / site builder solution. It allows for orders to be taken for products or subscriptions (with payment handled by Stripe).
My use case is I want to see new orders that come in and take the order details to pass on to fulfillment. For this I need to now what products are in the order, frequency of recurring subscription etc.
Squarespace has an extensive API. For examples of triggers / actions see https://www.integromat.com/en/integrations/squarespace