Website with simple subscription to member area (PHP/Linux)

General information for the website: Website sells a subscription to members area
Kind of development: New website from scratch
Description of every page/module: We have had a professional design done. Attached are low res JPGs for you to see what you will be coding. The JPGs have had the text removed for privacy. You will be provided full PSDs so don't worry.

The website is a single page website with photos and text as you can see in the attached design. Must be coded to be responsive.

Customers can click the buy button, pay by Paypal, after which they can log in to the members area for 45 days. It's as simple as that.

The members areas just contains some text and images. You only need to code one page with some text and an image, I will then copy-paste and create the other pages of the members area.

One of the pages of the members area is called "My Subscription" and should show user how many days they have left paid up.

I'd like to avoid creating a back-end control panel. My idea was that instead of using mySQL to manage the subscriptions the site can use a Google Spreadsheet via the Google API. Each time a customer pays their details are added as a new row on the spreadsheet with the date that their subscription ends. This was I can easily manage/view/edit subscriptions without the need for a back-end or mySQL database.

Will be hosted on Linux shared server.
Must use PHP.
If you plan to use a framework then please specify which one in your proposal.
Description of requirements/features: Code response homepage (one page)
Paypal payment integration which gives access to members area
Members area with password protection
Code one page in members area + logout feature + "my subscription" page
Use Google Sheet as database to view/edit/manage subscriptions instead of mySQL.
No back-end needed.
Specific technologies required: PHP
Extra notes: