Create the content of the message template
To define the contents of the message template, you must use its BodyText property. It is of type string. You can format it either as a plain text or as HTML text. First, you initialize the NewslettersManager. To create a message template, you call CreateMessageBody.
You set the MessageBodyType property to one of the following:
- HtmlText
- PlainText
- InternalPage
Then, you set the BodyText property and you save the changes.
The following code creates a message template with HTML text with the Native API.