PHp/MYSQL HTML Javascript Billing platform

We require a billing/payment website/platform for an application that we are developing. It needs to be developed using PHP 7.X and MARIADB on the backend and Javascript(jQuery) and HTML 5 on the frontend. Firstly we need: - a registration form where our users can register for an account by entering their e-mail address as the username and a password, which must contain atleast one uppercase character and one symbol (So the password input field would also require some kind of validator for the password strength). - The registration form must also contain a Captcha check, which users must solve to be able to register. - After the user presses the register button, they must receive an e-mail with a link to activate their account. - Once the link is clicked, the user is taken to a login page which tells them that the account activation was successful. - Users may only login once they activate their account using this link. The login process must use two factor authentication (Google's OAuth 2.0) and the e-mail and password from the registration process. Once logged in the user is presented with three options – packages of varying prices per app user. Procedure 1. user selects a business plan 2. after that redirected to a payment page 3. Enter how many licenses 4. Payment option includes 3 options - PayPal account - Braintree - or with cryptocurrencies (Etherium and Bitcoin). - - Once the user fills out all the required data to process the payment and once the payment is processed successfully, they should be redirected to a page with details about their order. This page should also contain a unique identifier (GUID) generated after the payment, which we can use to identify the user. The user should also receive an e-mail with the order details from this webpage. Users also need to have the option to upgrade or downgrade to a different business plan at any time via a ''change business plan'' button on the website. Users also need to have the option to change their e-mail address or password at any time. In order to change their e-mail address, users must enter their new e-mail address and current password into a form. When changing their password, they must enter their current e-mail address, their old password and their new password to proceed. Afterwards they must receive an e-mail notifying them about the password change. Users also need to have the option to reset their password, in which case a unique password is generated and sent to their e-mail, which can then be used to login into the billing website. The website should also contain a seperate page where users can view their past transactions, since we will use a monthly licensing plan. For that reason the website needs to track the amount of days before the expiration date of the licensing plan and should notify the user (via e-mail) about the expiration a few days prior. The design/look of the website itself does not matter, we just require the core functionalities to work as described above.