index.js
function cancelCampaign(callback, id){
    if (id===undefined) {
        return callback(returnError('Empty campaign id'));
    }
    sendRequest( 'campaigns/' + id, 'DELETE', {}, true, callback );
}
function cancelCampaign(callback, id){
    if (id===undefined) {
        return callback(returnError('Empty campaign id'));
    }
    sendRequest( 'campaigns/' + id, 'DELETE', {}, true, callback );
}
Cancel campaign

@param callback
@param id