How to authenticate with D365FO using Postman?

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Layan Jwei

8,058 Super User 2025 Season 2

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Let's say you are asked to call a certain custom service API in D365FO or maybe call an OData endpoint. To be able to do that, you first need to authenticate.

So in this article, I'm going to show you how to do that via Postman:

First you need to make sure that the ClientId is defined in D365FO environment. Go to System Administration - Setup - Azure Active Directory Applications
- In order to get this clientId, sign in to https://portal.azure.com
- Go to App registrations and choose your application, where you can find the ClientId
- In order to get the client secret, click on your app, go to "Certificates & secrets" and take the secret value. Or contact your admin to give you the values