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Hi,Greetings!You need to pass the parameters to the header while making the callout using POSTMAN.Please refer the steps in the below blog for the sample callout.https://www.sfdcstop.com/2019/01/how-to-connect-to-salesforce-with.htmlKindly mark it as best answer if it helps so that it can help others in the future.Warm Regards,Shirisha Pathuri