@snigdhaJogdand (Sorry I removed my previous answer as I misunderstood what’s the issue)
Anyway, I was able to call API via Postman with basic OAuth1.0 setup. You may want to check your ADVANCED setting area. Default settings worked for me though.
Also, you should select “Request Headers” for Add authorization data to setting:
If it doesn’t help, please double check that you’re using correct key and secret there. Again, but we highly recommend using twurl as it’s our official tool and easy to debug&help questions like this.
Best,
Shohei