curl --request GET \
  --url https://saas.pads365.com/rdx/NDS.Services.Authentication/api/v1/ExternalUserGroupMapping

{
  "Succeeded": true,
  "Message": "<string>",
  "Code": "<string>",
  "Mappings": [
    {
      "Id": "<string>",
      "RoleId": "<string>",
      "RoleName": "<string>",
      "ExternalGroupId": "<string>",
      "ExternalGroupName": "<string>"
    }
  ]
}