loadMRec static method
Load a new MREC ad. NOTE: The createMRec method loads the first MREC ad and initiates an automated MREC refresh process. You only need to call this method if you pause MREC refresh.
Implementation
static void loadMRec(String adUnitId) {
channel.invokeMethod('loadMRec', {
'ad_unit_id': adUnitId,
});
}