The referrer (who shares the invite code) will receive the referral reward only when the guest who uses the referral code to signup with the app registers the first valid purchase/ scan the 1st receipt in its account.
That means, If the friend used the Invite Code while signing up, Referral points will be credited to the referrer's account when his friend registers the first purchase in the app. And, the referrer must have a valid purchase registered in his account.
Reference article - Why is my guest unable to earn the referral reward?
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