Salesforce Connector: Connection Prerequisites
Before you run the Salesforce Connector Setup Wizard, you need to have an integration user in Salesforce and a Connected App.
For new connections, NetSuite recommends that you use an External Client App that you create and configure in Salesforce.
When creating the connection, you need to enter the credentials of the integration user in Salesforce. You need the user name, password, and integration token of your Salesforce user.
To use an External Client App, enable the Client Credentials flow and set the Run As user to the Salesforce integration user.