Since you are using the RingCentral PHP SDK, you can have a look at this demo code (https://github.com/ringcentral/ringcentral-php/blob/master/demo/callRecording.php), where it's shown how to read the call log and download the call recording binary file to a local folder.

For the message attachment, I guess that you get access to the message store. You can modify the demo code to read the message store, get the message attachment $URI and use the $apiResponse = $platform->get($URI); to get the attachment.

+ Phong

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I am using curl to download attachment of fax. Please help me as I am not able to download it using curl

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