Azure Graph

Tasks AD Graph.

Finding Application.

https://graph.windows.net/<tenantName>/applications?api-version=1.6&$filter=displayName eq '<Apllication Name>'

Finding Service Principal

https://graph.windows.net/<tenantName>/servicePrincipals?api-version=1.6&$filter=displayName eq '<Apllication Name>'

Finding roleAssignment

https://resources.azure.com/subscriptions/<SubscriptionId>/resourceGroups/<ResourceGrp>/providers/Microsoft.Authorization/roleAssignments