listMergeVarUpdate – v1.3

 listMergeVarUpdate(string apikey, string id, string tag, array options)

Update most parameters for a merge tag on a given list. You cannot currently change the merge type

Section
List Related

Parameters
apikey	a valid API Key for your user account. Get by visiting your API dashboard
id	the list id to connect to. Get by calling lists()
tag	The merge tag to update
options	The options to change for a merge var. See listMergeVarAdd() for valid options. "tag" and "name" may also be used here.

Returns
bool	true if the request succeeds, otherwise an error will be thrown