8.4. How can I trace the source of a purchase and run a partners program?

Interchange has a facility that adds a parameter called source to the session database for that user. You should give your partners a source code, which must contain at least one letter character (A-Za-z only). It is placed in the sourcing URL as a query string of:


If this is appended to the URL with which the user calls Interchange, it will then be placed in the session identifier source.

This URL:


will yield Source1 from the Interchange tag [data session source].

The Minivend 3 idiom ?;;Source1 continues to be supported, so existing partner sites should work without change.