curl --request GET \
  --url https://app.leadconduit.com/events/event-metrics/select_unique \
  --header 'Authorization: Basic <encoded-value>'

{
  "result": [
    {
      "vars.source.id": "<string>",
      "vars.recipient.id": "<string>",
      "result": [
        "<string>"
      ]
    }
  ]
}