Design payment Modules for a website (Only Asians)

I have a website which needs a Payment Module. It is basically a music website where customers can learn different musical instruments. So, I need you to design a payment module which can take payment for subscriptions weekly/monthly/yearly. The customer also should have the facility of changing the plan at a later stage may be weekly to monthly or viceversa. The payment flow must be user friendly and professional. If the customer wants to cancel the subscription, the facility is also to be included. Please do not bid more than 100 USD. We can pay you via bank transfer directly. Longterm relations are expected. Keep this code word REX as the first word in your bid so that I understand you have read it completely.