Client center for an online service with order form and API

I need a PHP / MySQL based script that integrates in an existing website. The website is already finished in clean HTML-CSS3, and your script can be included in the main part with an own navigation menu. Design elements and images will be provided (in PSD-Files and some in HTML). The script is for a service that extends given data with further information and replies them to the user via an API Interface. The service is already existent and can be called with a simple php function. It should have following 3 functional areas that will be explained in detail below. AREA 1: FRONTEND site for users 1.) Order form for two different tariffs (prepaid and post-pay) with PayPal disposal and user creation on success as well as sending out a confirmation email. User only has to pay with paypal for one of the two tariffs but also can decide to pay by wire transfer. 2.) Login page for registered users including reset password function 3.) Account dashboard with deposit information, account history, possibility for changing the user’s tariff on a second detail page and do new deposits via PayPal or wire transfer on another detail page. 4.) User details page with possibility to change user details 5.) Page with some simple API access data that is already in a MySQL table (API KEY and some endpoints). 6.) Page to upload CSV Files or post the file contents trough a textarea if not too big. Data should be loaded in a MySQL table and will be pushed with a cronjob that runs every minute (also your part) to the API described in area 3. After preceding the data it should be displayed in a dynamic table on a detail page and the user should be able to download the data in csv and excel. User shall get a mail when all data was preceded and see the current status on a page. AREA 2: BACKEND site for administrators 1.) Login page (single user, no user management needed for the backend site) 2.) User management (Show and edit details, Enable and disable users, search user, display account data and history of a user, change the tariff and payment method of a user) 3.) History of payments for a specific or all users with date range picker 4.) Add credits to user’s deposit account and insert a row in payment history (in case a user pays with wire transfer) 5.) History of usage for a specific or all users with date range picker 6.) Report for used credits and not used deposits with date range picker 7.) Billing-Report (show post-pay users with amount that has to be billed based on their API usage. The Report should also be sent with the users that have to be billed to a specific email address. Users are billed on the same date every month. AREA 3: Integrate API with usage control and billing features. 1.) An API should be built around a php function that needs two variables and returns a small array (about 20 values). 2.) API Framework will be provided ([login to view URL]) 3.) API Framework has to be extended by usage quotas (per hour / per day / credits), logging to database and billing (credits should be billed to a user according to the result). MISC: 1.) Field verifications should be done with JavaScript (client) and php (server). 2.) Code should be commented and a short developer manual has to be provided. 3.) Script will be used in a multilingual context, so it has to be able to handle more than one language. 4.) No rights of other people should be violated. 5.) Zend Framework or symfony would be great but we can agree on another framework (if you want to use one). 6.) OO and a good coding style is required.