Start an Affiliate Program from your WordPress Website
It's not uncommon for a Referrer to be blank or missing on your Clicks data. There's a large number of things that this can happen, some of the most common are below. Unfortunately in most cases, there's not a lot you can do to fix it as you cannot do anything to change the way the site's your affiliates share you links on handle referrers.
Direct Visit: If a user types or copies/pastes an affiliate link into their browser's address bar directly, there will be no referrer.
Private/Incognito Browsing: Some web-browsers will strip referrer information if the user is browsing in Incognito/Private mode.
HTTPS > HTTP Downgrade: Many times the referrer will be dropped if the user clicks an HTTP affiliate link from a site that uses HTTPS. To help prevent this, make sure your WordPress site has a proper and forced HTTPS (SSL/TLS) certificate. Work with your webhost to set this up.
rel=”noreferrer”: If your affiliates add this rel tag to their links before sharing them, most browsers will strip out the referrer. You can add a policy to make this against your affiliate terms, but you'll have to be proactive in monitoring it.
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