BEARER_TOKEN="3n3u4u72SJbX3nII+7qJyoT6lRjsEUxxhLWSlH/UyYw="

curl -X POST https://app.engn.jp/api/v1/deliveries/transaction \
  -H "Authorization: Bearer ${BEARER_TOKEN}" \
  -H "Content-Type: application/json" \
  -d '{
    "from": { "email": "lucamlm99@gmail.com" },
    "to": "fpc_xu@163.com",
    "subject": "Test",
    "text_part": "Test mesaj"
  }'