Hi, when I am trying to use Netsuite OAuth2.0 in postman I am getting 'Invalid login attempt' in the new window that opened when i click 'Get New Access Token' in postman. what can be the issue? (consumer key & secret are correct for sure)

depends on how far you are getting into the auth process

I set all the parameters include consumer tokens and auth url and when i login in the new window that opend after i click 'get new access token' in postman its give me invalid loging

and if you are using your actual browser

i am using my actual browser

that sounds like you got far enough to use the login audit trail

i am getting success in the audit trail that what strange here

try doing something wrong like using the wrong redirect uri

my mistake, redirect URI was wrong

I'd recommend taking a look at the newer Client Credentials flow if this is a system-system application