How to Obtain an Access Token for Azure Cost Management API Calls

In this article I will explain how to obtain an Access Token which will be used when calling Azure Cost Management APIs.

Following were the steps I used

Create an App Registration and Note the Tenant ID and Client ID

Next, generate a client secret and store it securely.

Our app registration is now successful. Next, we need to assign the service principal (app registration) the appropriate permissions to access cost data from our subscription.

Go to your Subscription, navigate to the Access Control (IAM) section, and click on 'Add role assignment.

We will assign the Cost Management Reader permission

Next, select the App registration we created and complete the role assignment process.

That's all we have to do within Azure portal. Let's construct our API request using Postman client

#URL
https://login.microsoftonline.com/{Tenant ID}/oauth2/v2.0/token

#METHOD
POST

#X-WWW-FORM-URLENCODED
#X-WWW-FORM-URLENCODED
grant_type=client_credentials
&client_id={Client ID}
&client_secret={Client Secret}
&scope=https://management.azure.com/.default

Following is the response I get with the access token