Hi, I'm trying to use a context enricher

Hi, I'm trying to use a context enricher to remove the referrer property when the traffic is coming from a payment processor in order to prevent it from showing up in Google Analytics as traffic. This is the context enricher worker I wrote: const referrerList = [ 'pay.skrill.com', 'commerce.coinbase.com', 'paymentpage.ecommpay.com', ]; function checkReferrer({ system, client }) { if (referrerList.some((referrer) => system.page.referrer.includes(referrer))) { system.page.referrer = ''; } return { client, system }; } export default { async fetch(request, env, ctx) { const { system, client } = await request.json(); const newContext = checkReferrer({ system, client }); return new Response(JSON.stringify(newContext)); } }; I've added it to Zaraz settings (see attached screenshot) but nothing seems to be happening, the blocked referrers still show up in Google Analytics. Any help would be most welcome.