This method will return member types setup in the system.
|business_code||Integer||This is the business we are working within.|
|xmlmode||Integer||This is a variable that helps tell us what xml items to return.|
|membership_type_group_id||Integer||This askes what member type type we want returned.|
|active_in_commerce||Boolean||(Optional) Filter you can use to only return active in commerce member types.|
|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|