> ## Documentation Index > Fetch the complete documentation index at: https://docs.mention-me.com/llms.txt > Use this file to discover all available pages before exploring further. # How to Restrict Referrer Eligibility to Paying Customers > Stop non-customers from becoming referrers by setting eligibility rules at the offer or campaign level. You can stop non-customers from becoming referrers at either the offer or campaign level within the Mention Me platform. For background on why non-customers can become referrers by default, see [Understanding Non-Paying Referrers](/knowledge/referral/customers/understanding-non-paying-referrers). ## At an Offer Level Follow these steps to ensure only paying customers can refer friends. Click **Campaigns**, then click the name of the campaign you wish to amend. Click **Drafts, Upcoming & History**, then click the experiment actions menu (three dots) and select **Duplicate (to draft)** or **Create New A/B Test**. Click the offer actions menu (three dots), then click **View Offer Settings**. Click the **Auto-Decline Rules** tab, then click **Add Rule**. Select the **Referrer Must Be a Paying Customer** option. Auto-Decline Rule: Referrer must be a paying customer option selected in Offer Settings Click **Save**. ## At a Campaign Level You can block manual registrations for new referrers via the embedded registration page in the campaign settings. Click **Campaigns**, then click the name of the campaign you wish to amend. Click **Manage**, then click **Settings**. Click the **Advanced Options** tab, then click the checkbox for **Block manual registrations from new referrers (eg via submitting the form on an embedded registration page)**. Checkbox for 'Block manual registrations from new referrers' selected in Advanced Options of Campaign Settings Click **Save Changes**.