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FYERS API
Arindam Ghosh
Algo Trader
Asked a question last year

Problem loggin into Fyers API v1: Is there any problem in fyers api today? I am getting the message {'code': 401, 'data': [], 'message': 'Could not authenticate the user'} while trying to log into api. After restarting multiple times it started working.

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Hi Sir,
Sorry for the trouble you faced and for so late reply.
Currently we have migrated to API V2.
Hop you will not face such issue here if all step is followed as per the Documentation.
Here is the documentation link104 for the Authentication Process.
Happy Trading.