curl --request GET \
  --url https://api.pocketflows.com/triggers/{id}/sent_emails \
  --header 'Authorization: Basic <encoded-value>'

{
  "sent_emails": [
    {
      "id": "<string>",
      "created_at": "<string>",
      "customer": "<string>",
      "subject": "<string>",
      "sent_at": "<string>",
      "failed_at": "<string>",
      "failed_reason": "<string>",
      "sendgrid_message_id": "<string>",
      "paubox_message_id": "<string>",
      "postmark_message_id": "<string>"
    }
  ]
}