Delete a datapoint (or a conversion) is very simple using ClickMeter’s APIs. It’s a matter of just one request using the DELETE method.
$output = api_request('http://apiv2.clickmeter.com/datapoints/' . $datapoint_id, 'DELETE', NULL, $api_key);
$datapoint_id: the identifier of the datapoint to be deleted.
The response body will contain the identifier of the deleted datapoint.