What is the Api key of OpenAI

How can I download the API key

You don't "download" the API key.
This is also a simple Internet search: how to create openai api key at DuckDuckGo

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What is the Api key for OpenAI

If you login to openai with your account you can follow the link on this page:

https://help.openai.com/en/articles/4936850-where-do-i-find-my-openai-api-key