A character string containing a QualificationTypeId.
worker
A character string containing a WorkerId, or a vector of character strings containing multiple WorkerIds.
reason
An optional character string, or vector of character strings of length equal to length of the workers parameter, supplying each worker with a reason for revoking their Qualification. Workers will see this message.
verbose
Optionally print the results of the API request to the standard output. Default is taken from getOption('MturkR.verbose').