To restrict your referral program so only customers who have previously ordered from you can send referral in your Shopify store:

  1. Login to your Shopify Store.
  2. Click Apps in the left menu.
  3. Find RewardStream Referrals in the list of apps and click on it
  4. Find the Options section and check the box to require customers to have made at least one purchase before they can send a referral. You'll also want to review the message to show to customers if they try to refer without having made a purchase from you previously. 
  5. Click Save on the top right of the page.

Uncheck the box to make it so anyone with a My Account on your store can send referrals. 

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