Shopify website set up.

Hello, I wanna have a Shopify store , I have the ideal theme already , I wanna add some function , like the member center , clients will be classified according to our setting, different level clients will enjoy different discount on products price. after clients log in, client can register and reset password , download the invoice , see items name and quantity , price ,discount ,we can upload tracking number and the tracking website.

Beside, set the payment methods like stripe , PayPal , credit card , after pay and klarna etc.

Of course it’s must be responsive and finished onsite SEO