Expanded partner program

Add to the affiliate program rewarding users for recommending the website. The user receives a referral commission plus additional credits and gets plan. The amount of credits and what plan and for what period of time is set by the administrator. To encourage users to use the affiliate program, levels will be set by the administrator. e.g. level 1 = invite of 1-10 referrals For each referral, the user gets 5% commission level 2 = invite 11-20 referrals For every referral, the user gets 10% commission + credits level 3 = invite 21-30 referrals For every referral, the user gets 20% commission + credits + plan e.t.c...