Steps to get access token using integration with OAuth 2.0(Authorization code grand)

• Open the URL in the browser: https://{accountId}.app.netsuite.com/app/login/oauth2/authorize.nl?scope=restlets+rest_webservices&redirect_uri={redirect_uri}&response_type=code&client_id={client_id}&state=state_passthrough_parameter_value&access_type=offline
• Click on Continue. It will redirect to URL. Copy the value of URL parameter code.
• Use code to fetch refresh token

Endpoint: https://{account_id}.suitetalk.api.netsuite.com/services/rest/auth/oauth2/v1/token

Provide the code, redirect URI and grand_type on the request body. API call and fetch refresh token

• Use this refresh token to generate access token.

Endpoint : https://{account_id}.suitetalk.api.netsuite.com/services/rest/auth/oauth2/v1/token

Provide the refresh token, redirect URI and grand_type on the request body. API call and fetch access token.

Use the access token in the final endpoint.