At any point of time you can query Newzmate regarding subscription status of any subscriber using the following HTTP GET method:

http(s)://api.traq.li/tracker/securesub/email/<reader_email>/ml/<idX>?
api_key=<api_key>

Returned HTTP code shall indicate subscription status:

HTTP200: reader <reader_email> is subscribed to list <idX>

HTTP404: reader <reader_email> is not subscribed to list <idX>

HTTP 500: server error encountered (see HTTP logs or contact Newzmate agent for further steps)

For obtaining secret API key and idX, idY, ... values please contact Newzmate Support Team at info@newzmate.com 

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