Authorization parameters needed for services/rest/record/v1

Hello,

From the following documentation,

https://docs.oracle.com/en/cloud/saas/netsuite/ns-online-help/section_1545222128.html

I am trying to use postman with a GET request:

GET https://demo123.suitetalk.api.netsuite.com/services/rest/record/v1/customer?q=email START_WITH barbara

However, the response I get is 401 unauthorized.

I looked at the previous docs, and followed steps, and I was able to get a bearer token.

I passed the bearer token into Authorization -> Bearer Token in postman, however I still get invalid login error.

Do you guys know what other parameters or headers need to be passed?

I was able to get the bearer token by following docs, and creating the integration records and all that.