Piwik attributes conversions to the last seen referrer by default. How do I credit conversions to the first referrer instead?
When visitors convert a Goal, Piwik tries to attribute the conversion to the referrer that brought the visit to the site. Piwik by default, will credit the last non empty referrer that was used by the visitor before he reached the Goal. In some cases, several referrers can lead a visitor to the website on different visits (eg. Search engines, Newsletter link).