You can record a conference call at Plivo in two ways
Using record API:
The Record API can record live calls at any time during the call and returns the URL of a file containing the audio recording.
For more details: https://www.plivo.com/docs/api/call/record/#record-a-call
To get the callUUID of the conference call which is ongoing so as to record the call, you can make use of this API https://www.plivo.com/docs/api/conference/#details-of-a-conference
Using Record attribute in conference XML:
You can use the ‘record’ attribute by setting it to ‘true’ in the conference XML so as to record the conference call.
<Conference record="true">My Room</Conference>
You can also setup the recordFileFormat as either Mp3 or Wav.
For more details: https://www.plivo.com/docs/xml/conference/#attributes