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there is a rather large topic on <https://system.netsuite.com/app/help/helpcenter.nl?fid=chapter_4399047360.html|Integration Management>

you can theoretically skip to <https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4393879073.html|Creating an Integration Record>

but fair chance you need to have a good understanding of integration records if you are building an integration

its the kind of thing that can go very badly if you mistreat the client id or secret

<@U5TF1GQ20> the links you sent me are for SOAP right? does it apply the same for REST?

<@U5TF1GQ20> I have followed documentation but still same error

I have posted a question on stackoverflow with some more details in case you want to give it another look

<https://stackoverflow.com/questions/67912649/netsuite-rest-oauth2-invalidintegration>

what does your integration record look like

Another developer provide me the customer id and secret, but they were incorrect, I tried resetting credentials and it worked

its the warning i gave you about mistreating the keys

<@U5TF1GQ20> Good day, I was able to get the access_token