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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”.