Azure Batch Service REST API

In the Azure portal, open your Batch account and retrieve one of the account access keys from the account settings described in Manage Batch accounts. The Batch REST auth doc states the Batch service supports authentication via Shared Key; use your Batch account name together with one of its access keys to sign requests.

Register an application in Microsoft Entra ID from the Azure portal as described in Authenticate Azure Batch services with Microsoft Entra ID and standard Azure app registration flows. Then acquire an OAuth access token for the target resource/audience required by the API: Batch uses https://batch.core.windows.net/, and Azure AD Graph / Graph RBAC uses a token for https://graph.windows.net/.