Nothing
#' Set API Key
#'
#' Before anything else, get the API key from \url{https://www.virustotal.com/en/}.
#' Next, use \code{\link{set_key}} to store the API key in an environment variable \code{VirustotalToken}.
#' Once you have set the API key, you can use any of the functions.
#'
#' @param api_key API key. String. Required.
#'
#' @export
#'
#' @references \url{https://developers.virustotal.com/v2.0/reference}
#'
#' @examples \dontrun{
#'
#' set_key('api_key_here')
#'
#' }
set_key <- function(api_key = NULL) {
if (!is.character(api_key)) stop("Must specify API Key.\n")
Sys.setenv(VirustotalToken = api_key)
}
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