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I am using Heygen Free tier.

Earlier, I was able to use https://api.heygen.com/v1/video_agent/generate API to generate videos using video agent (with a text prompt). I used to be able to see my remaining credits (out of 10) in Settings --> API --> Overview --> Usage

Now, I just see "0 used" in the usage section and my credits don't seem to be refreshing every month.
When I try to use the api, I am getting "requests.exceptions.HTTPError: 402 Client Error: PAYMENT REQUIRED for url: https://api.heygen.com/v1/video_agent/generate"

Can someone please check and let me know why this is happening and how can I fix it?

Thanks.