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"memberid" is the unique ID code generated by NATS for this member.
"natssess" is the NATS unique session ID code. Just like a PHP session.
"nextra[NETBILLING][cisp_storage]" value="1" the nextra bit is a NATS option to send extra info to processor/biller. The [cisp_storage] stands for "Cardholder Information Security Program" (Payment Card Industry (PCI) Data Security Standard) from VISA that will be handled in this case by NETBILLING (biller) and can be flagged as 0 or 1. Flagging it as 1 means this card is to be securely stored by the biller [NETBILLING] for future rebills. Flagging it 0 means a one time purchase, so no rebills should be processed. So the string is just telling NATS to add the "this is flagged as 1, so enable rebilling" to NETBILLING for processing when they hit the join button.
Most of them are just options that billers can enable/require on the Join Form for their own tracking/processing, I do not think an affiliate can track them.
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