Example: Incoming text/plain

Let's say you want to save the following text/plain content in a richtext field:

this is the body text

You use that as the content in the following Rich Text JSON:

{
  "type": "text/plain",
  "encoding": "PLAIN",
  "content": "this is the body text"
}

This saves a text/plain MIME:

MIME-Version: 1.0
Content-Type: text/plain

this is the body text