Cancel the Envelope in AssureSign using a SALESFORCE Flow

We use the DocGen component (in DocGen for SALESFORCE) connected to eSign (formely ASSURESIGN).
A Docgen document is generated and sent to AssureSign platform. This action create a "Nintex eSign Envelope" object in Salesforce.

Sometimes, a user generates several "Nintex eSign Envelope" and we want to Cancel unnecessary envelopes by a SALESFORCE flow.

I know that it exists a "Cancel" Button in the "Nintex eSign Envelope" object but we want to operate this action using a Salesforce Flow.

We have seen in the NINTEX Help a new way of working : https://help.nintex.com/en-US/assuresign/DeveloperResources/SOAPMethod/CancelEnvelope.htm