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Best practices for securely using API keys

When you use API keys in your applications, take care to keep them secure. Publicly exposing your credentials can result in your account being compromised, which could lead to unexpected charges on your account. To keep your API keys secure, follow these best practices:
Do not embed API keys directly in code
API keys that are embedded in code can be accidentally exposed to the public—for example, if you forget to remove the keys from code that you share. Instead of embedding your API keys in your applications, store them in environment variables or in files outside of your application’s source tree.
Do not store API keys in files inside your application’s source tree
If you store API keys in files, keep the files outside your application’s source tree to help ensure your keys do not end up in your source code control system. This is particularly important if you use a public source code management system such as GitHub.
Restrict your API keys to be used by only the IP addresses, referrer URLs, and mobile apps that need them
By restricting the IP addresses, referrer URLs, and mobile apps that can use each key, you can reduce the impact of a compromised API key. 
Delete unneeded API keys
To minimize your exposure to attack, delete any API keys that you no longer need.
Regenerate your API keys periodically
Update your applications to use the newly-generated keys. 
Review your code before publicly releasing it
Ensure that your code does not contain API keys or any other private information before you make your code publicly available.
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