Adapt a website (I already developed) advertising + add a purchase + place to chat between the administrator and premium users

The site is ready, responsive (desktop or martphone), but I just wanted to add: 1.1 schedule the purchase service. There will be no shopping cart. Therefore, you must have options for ways to purchase. 4. Registration form (with some data) and confirmation via SMS code and validation, obviously, for those who want to be an associated prize; 3. Log in to the Premium member. 4. Second tab, where each member can chat with the administrator in a type of chat. This page must have: 4.1. Blue read warning. 4.2 Show whether the user is online or not. 4.3 A payment option, where a member must choose the amount to be paid and the form of PAYMENT, as it is there that he performs the monthly registration of his plan. 4.4 In this conversation guide, you can send images. 4.5 When you click on the image, it should remain larger, such as Facebook or WHATSAPP. 4.6 Display a valid validity timer for the service purchased (30 days, adaptable to 31 months). 5. Receive notices (reminders) on the computer or cell phone: just like whatsapp, informing the new message sent.