That information would be more appropriate on the other question I just asked about implementing proactive rate limiting, at Proactive rate limiting vs. reacting to 429s? - Questions - Square Developer Forums
It doesn’t satisfy the request for a 429 test endpoint in your APIs, as the logic you use server-side to determine when to respond with a 429 doesn’t affect whether or not the client (either your SDK code or our application that’s using your SDK) handles the 429 properly.
I’m sure your SDK does handle it properly, but I want to be able to prove that, and to test our handling of the error returned by the SDK.