lib/AdobeMarketingCloud/Api.php
protected function delete($path, array $parameters = array(), $requestOptions = array())
    {
        return $this->client->delete($path, $parameters, $requestOptions);
    }
protected function delete($path, array $parameters = array(), $requestOptions = array())
    {
        return $this->client->delete($path, $parameters, $requestOptions);
    }
Call any path, DELETE method
Ex: $api->delete('calculatedMetrics/12345abcedf')

@param   string  $path             the AdobeMarketingCloud path
@param   array   $parameters       POST parameters
@param   array   $requestOptions   reconfigure the request
@return  array                     data returned