How can I cancel or delete an Envelope/Form that is out for signature using API?

I’d like to be able to place an API call or similar to cancel an existing envelope/document that is out for signature. Currently it seems that if no expiration was specified they will stay indefinitely and there is no way to cancel aside from manually deleting.

Hi there, this control is not yet available through API. Would be best to utilize expiration settings and then the manual intervention for your unusual cases.