You may not perform more than 10 requests per second, nor more than 2 simultaneous requests.
We are going to be building a simple tool in PHP that aggregates data based on a domain name and are looking for the basics on how to fulfill that requirement. We are planning for hundreds/thousands of potential simultaneous users.
Maybe someone can provide some pseudo code in PHP that would let us do this - or is it really just as simple as forcing the actual API request function to sleep for 1 second in between each command? I don't have a lot of experience with APIs and large amounts of concurrent users so any help is appreciated.