A Checkbox Place is a type of Place that marks a specific area in the document where the recipient, as identified by the recipient_key, can check a box.
Checkbox places are only available in envelopes with sequential signing.
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.
Specifies whether the recipient must check this box to complete the signing ceremony.Possible values are required or optional. The default is optional.