Optional Fields for Updating a Session

These are the optional fields you can include to update an existing session.
Set to the same value as the
billTo_state
field if the field is present.
billTo_language
If this field is not included, the language is set to English by default.
For a list of possible values, see the
ISO Standard Language Codes
guide.
Set to the same value as the
billTo_district
field.