You can, for example, check out ReferralCandy. It has helped over 30,000 online stores in a wide range of industries with their referral programs. It basically runs your referral program on autopilot. You can use its app to customize your reward options by offering incentives like cash rewards, custom gifts, or store discounts. It also integrates with the main eCommerce platforms and marketing platforms such as Mailchimp and Klaviyo. While it’s a bit more expensive, it’s very easy to use.