| parameter | value | type | default / required* | notes |
|---|
| nkey | | token | * | Session key or token. Automatically assigned (only if optional) or obtained via acct_login/acct_token call. |
| labelid | | int | | deprecated - ignored. |
| name | | string (60) | * | Client name (first last). |
| email | | string (80) | * | Account email address, and account credentials. |
| passwd | | string | | Account password. Please use a minimum of five characters including at least one digit or non-alphanumeric character.. |
| lang | | string (6) | | Language, two chararters, following ISO 639. |
| reghost | | string (65) | * | Name or IP address of the node where the registration was initiated. |
| regrefer | | string (255) | | URL that refered client to the site the first time. |
| timezone | | string | | Timezone name, example: Europe/Amsterdam. |
| company | | string (60) | * | Company name. |
| address | | string (60) | * | Address. |
| zip | | string (10) | * | ZIP or postal code. |
| city | | string (40) | * | City. |
| state | | string (40) | | State or province. |
| country | | char (2) | * | Country, following ISO 3166. Examples: us, gb, nl. |
| telnr | | string (256) | | Telephone number, including "+" and international prefix. |
| faxnr | | string (15) | | Facsimile number, including "+" and international prefix. |
| opt-in | | boolean | y | Opt-in for newsletters. |
| callback | | string | | Callback function for JSONP style calls. When this parameter is given, the result will be JSON instead of XML. |
| view | | enum (xml, json) | xml | Specifies the desirable representation of the output (XML or JSON). HTTP Accept header can be used and has precedence. |