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The api call works on postman but when i am trying to make a javascript call, it fails

writing your own code or copied the postman code for API call?

if its working in postman then you can directly copy the code from there

here is the icon for code generated by postman

But as its oauth 1.0, the curl calculates the nonce, signature etx..

there are many languages available and can make changes to it

the serverless function shouldnt have a cors problem

There the authentication fails, i am copying code from postman

copying code from postman is unlikely to help you here

you are copying a previous request, and oauth 1 is specifically designed to prevent that

I have improvised the code. I am using rhe same credentialz. We are generating new header as per oauth 1.0

But using the same user key, secret, token and token secret

i will not debug homemade oauth 1.0a unless you try using a library first

my general recommendation for javascript is <https://www.npmjs.com/package/oauth-1.0a>

what do the details from <https://system.na0.netsuite.com/app/help/helpcenter.nl?fid=section_1534941538.html|TBA and the Login Audit Trail> say

I dont have acxess to the login audit trail

I am building an application foe thr customer.