This method will add a POS to a reservation.
|business_code||Integer||This is the business we are working within.|
|rez_id||Integer||This is the rez_id of the reservation we are adding the POS to.|
|client_id||Integer||This is the client_id of the client who is asking to add the POS on the reservation.|
|amount||BigDecimal||This is the amount being transferred over to the reservation.|
|format||enumeration||(optional) Set this value to "xml" for XML raw formatted output, "xml-clean" for XML tidy formatted output or "json" for JSON formatted output. If not passed, "xml" is used as a default|