curl --request POST \
  --url https://www.dench.com/api/v1/email/templates/{templateId}/preview \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "data": {
    "firstName": "Ada",
    "company": "Lovelace Labs"
  }
}
'

{
  "subject": "Hi Ada",
  "htmlBody": "<p>Hi Ada, saw your work at Lovelace Labs.</p>",
  "variableNames": [
    "company",
    "firstName"
  ]
}