curl --request PUT \
  --url https://api.morphic.io/api/email-templates/{template_id} \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "subject": "<string>",
  "body_html": "<string>",
  "is_favorite": true
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "account_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "user_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "subject": "<string>",
  "body_html": "<string>",
  "is_favorite": true
}