Affiliate to old opencart 1.5.6.4

1.Referrer receives store credit equal to 10% of future order of a new customer 2. new customer gets 15% discount for the first order he is doing while entering the refeeral code I will check manually that its not fake referrals. The % should be variable i can change. Customer registers. Customer enters referral code. Referral is saved. First order completed. Friend automatically gets 10% off. Referrer receives store credit equal to 10% of the order. Store credit can be spent on future purchases. Credit history is shown under "My Rewards." Example: Friend spends Friend saves Referrer earns $50 $5 $5 credit $300 $30 $30 credit $800 $80 $80 credit