Where can I find my authentication key?

Authentication Key

Please visit the API page using the 'API' option in the sidebar
On this page at the top left corner, you will find a 'KEY'  which you can use in your API's
You can also generate multiple auth keys for your account and name them, this can be useful if you are using the same account for 2 or more applications/websites and you can disable/enable any of the auth keys if required.