Hi @anon16649369,
Zapier does not have the functionality “out of the box” to create a new project from a template; you need to use its custom webhooks capability.
So you have two options: you can use Zapier custom webhooks - see this post for more info on that:
Or you can use our Flowsana integration - it has an If-Then Rule action to do exactly what you want, create a new project from a template. You can’t directly trigger that rule from an external application like Stripe, but what you can do is create a Zap that adds a task to a particular ‘New Customer’ Asana project when Stripe sends a new-customer event to Zapier, then create a Flowsana rule something like “When a new task gets added to the ‘New Customer’ project, then create a new project from the ‘Customer Onboarding’ template”.