Role based access control provides you a way to apply granular level policy administration down to individual resources or resource groups. These operations enable you to manage role assignments. A role assignment grants access to Azure Active Directory users.
curl \
-H "Authorization: Bearer $ACCESS_TOKEN" \
/{roleId}curl \
-H "Authorization: Bearer $ACCESS_TOKEN" \
/{scope}/providers/Microsoft.Authorization/roleAssignmentscurl \
-H "Authorization: Bearer $ACCESS_TOKEN" \
/{scope}/providers/Microsoft.Authorization/roleAssignments/{roleAssignmentName}