curl --request PUT \
  --url https://api.example.com/api/ESigning/EmailTemplates/{TypeId} \
  --header 'Content-Type: application/json-patch+json' \
  --data '
{
  "id": 123,
  "subject": "<string>",
  "body": "<string>"
}
'

[
  {
    "id": 123,
    "subject": "<string>",
    "body": "<string>"
  }
]