How can I make a discount available to a referred friend at their time of signup?

Let's say you want to offer a double-sided reward where the referred friend gets a coupon code available at the time of initial signup (before any purchase or signup is made).

You would need to create a single-sided or milestone reward for this purpose because double-sided rewards in GrowSurf are only unlocked for a referred friend after they trigger a referral.

You have a few options for how to make a coupon code immediately available for a referred friend:

1. When your Share URL is visited directly (e.g, http://yoursite.com)
   1. This option would make the coupon code available for anyone who lands on your Share URL
2. When your Share URL is visited with a unique referral link (e.g, http://yoursite.com?grsf=abc123)
   1. This option would make the coupon code available only if a new visitor visited your site using a participant's unique referral link, which you can verify by calling growsurf.getReferrerId().
   2. (Optional) To fully lock down your coupon codes to visitors who used a valid participant's unique link, you can call growsurf.getParticipantById() and only make the coupon code available based on if the referrer ID is a valid participant. Here is a snippet of JavaScript code you can use:
      

      // Check to see if GrowSurf is available
      if (!window.growsurf) {
        function applyCouponCode() {
          const referrerId = growsurf.getReferrerId();
          if (referrerId) {
            growsurf.getParticipantById(referrerId).then(participant => {
              if (participant) {
                // Apply your custom coupon code here
              }
            });
          }
        };
      
        // Listen and wait for the Growsurf Universal Code to initialize
        window.addEventListener('grsfReady', () => {
          console.log('GrowSurf is ready!');
          applyCouponCode();
        });
      } else {
        console.log('GrowSurf is already available');
        applyCouponCode();
      }