Recipient Email Place let you insert the email address of the recipient, as identified by the recipient_key, at a location in the document.You can position recipient name places inside a document using either fixed positions or placeholders.
For example, this is a definition of a recipient email place for the recipient with key client, linked to the placeholder client_email inside the document:
A user-provided key that identifies a place within a document.It must be up to 32 characters long, using only lowercase letters, numbers, or underscores, and it must begin with a letter.