A response code of 429 means you have exceeded the allowed rate limit for your subscription plan level. This is easy to solve — simply wait the necessary duration for your rate limit to reset and you will be able to make API requests again.
You may also inspect the HTTP headers of every API response to get more information about your subscription plan’s rate limitations such as your allowed rate limit, how many requests you have remaining within your current rate interval, and the time of your next interval when your rate limit will reset.