Creates an isolated demo customer and returns a sandbox API key. No authentication required. Rate limited to 5 requests per IP per minute.
api_key is prefixed with sk_demo_ and is the only credential you need
for all subsequent API calls. It is returned exactly once - there is no retrieval
endpoint. Save it immediately.
The customer_id is the scope your key is bound to. It is reserved for future use; do
not rely on its format.
Demo session created