UPCOMING new per-app rate limiting

In our continuing efforts to maintain a fast, responsive, merchant experience, we will be rolling out a system for rate-limiting the total number of requests generated by a single app. By default this limit will be a maximum of 50 requests per app per second, and can be lowered to mitigate apps with sustained periods of very high request volume. Any app should be prepared to respond dynamically to 429 responses. If your app has a regularly scheduled high-request-volume job, we strongly encourage you to stagger the timing of this job for different merchants.

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