Update iThemes Exchange to use new calculate_referral_amount() method. #1
Update JigoShop to use new calculate_referral_amount() method. #1
Update MemberMouse to use new calculate_referral_amount() method. #1
Update Paidmembershipspro to use new calculate_referral_amount() method. #1
Update RCP to use new calculate_referral_amount() method. #1
Update Shop to use new calculate_referral_amount() method. #1
Update WPEC to use new calculate_referral_amount() method. #1