Why have I not received my referral credit?

The referral credits remain in your Shopmium account and will be automatically applied to your future Shopmium cashbacks. They are not sent to your PayPal or bank account, as they are Shopmium credits.
You will receive the credit once your referred friend’s first cashback is accepted. Referral credits will not be granted if the referred friend registers with the same PayPal or bank account, as this is a means of preventing fraud.