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Goto https://selfregistration.cowin.gov.in/ on the browser of your choice
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Open the Developer Console.
- From the Network Options, select Offline
- Enter your mobile number and click on Get OTP
- In the network tab you will see an XHR request to generateMobileOTP. Click on that and scroll down to Request Payload Section
- Click on View Sources
- The Long String you see after "secret":, and inside the quotations is your new API Key.