curl --request POST \
  --url https://api.nitrosend.com/v1/my/templates/{id}/send_test \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "email": "jsmith@example.com",
  "contact_id": 123
}
'

{
  "sent": 123,
  "results": [
    {
      "email": "<string>",
      "success": true
    }
  ]
}