PAAPI - Rate Limit Exceeded but only for one marketplace, ok on all others

The issue you're experiencing with the Amazon Product Advertising API (PAAPI) for the amazon.com.au marketplace is likely related to rate limiting specific to that particular region. Each marketplace may have its own set of rate limits, and it appears that the Australian marketplace might have more stringent restrictions compared to others.

To address this problem, you can try the following approaches:

1. Implement an exponential backoff strategy in your code. This involves increasing the delay between requests if you encounter a rate limit error. Start with a small delay (e.g., 1 second) and double it each time you receive a "TooManyRequests" error.

2. Reduce the frequency of your requests to the amazon.com.au marketplace. You may need to space out your calls more than you do for other marketplaces.

3. Check your PAAPI credentials and ensure they are correctly set up for the Australian marketplace. Sometimes, authentication issues can manifest as rate limit errors.

4. Review the specific rate limits for the amazon.com.au marketplace in the PAAPI documentation. Different regions may have different thresholds for the number of requests allowed per second.

5. If the issue persists, you may want to contact Amazon's support team specifically about the Australian marketplace to inquire if there are any known issues or additional requirements for that region.

Remember that rate limits are put in place to prevent overloading of the API and to ensure fair usage across all users. If your use case requires a higher rate limit, you might need to request an increase from Amazon, although this is not guaranteed to be approved.
Sources
Problem with Amazon API | AWS re:Post
Troubleshooting Amazon ECR error messages - Amazon ECR