- session_id [xsd:string]
- Your API session id.
- list_id [xsd:int]
- The id of the list whose custom field names are being set.
- fields [vrtypens:ArrayOfString]
- The names of the custom fields that should exist for this list.
- widths [vrtypens:ArrayOfString]
-
An array of widths for the custom fields. This array should match 1 on 1 with the fields array.
Allowed widths: “small” (25 characters), “medium” (125 characters), “large” (255 characters). Defaults to “medium”.