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session_id [xsd:string]
Your API session id.
list_id [xsd:int]
The id of the list whose attribute is being updated.
attribute_name [xsd:string]
The name of the attribute that’s being updated. This must be either “name”
or “form_id”.
attribute_value [xsd:string]
The new attribute value. If the “name” argument was set to “name”, the list’s new name will be changed to this. If the “name” argument was set to “form_id”, and this list doesn’t already have an opt-in form associated with it, then the list will be attached to the opt-in form specified by this value.