Hi @Shubham_Kumar, Once you call the fetch-modes API, then 2 things will happen:-
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You will get HTTP status 202 on postman along with a correlation-id in response header.
There is no need to generate the correlation-id from your side.
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on-fetch-modes will be called by abdm and you will receive the on-fetch-modes payload on your endpoint along with the same correlation-id in header.