Retrieve a single custom email template by id, including its content and styles.
200 Success.
400 Bad Request
401 Unauthorized
Unexpected error
{- "added_at": "string",
- "modified_at": "string",
- "template_code": "string",
- "template_id": 0,
- "template_styles": "string",
- "template_subject": "string",
- "template_text": "string",
- "template_type": "string"
}