When an application reaches the API calls per user (or per second), the response will be "429 Too Many Requests" with Retry-After seconds in HTTP header
https://developer.box.com/guides/api-calls/permissions-and-errors/rate-limits/
But what's the error if an application reaches API calls of a business plan (e.g. 25000 calls / month) ?
https://www.box.com/en-gb/pricing/business