Django integration with Stripe

We are the early stages of building a simple Django based web application for inventory management. Users will be billed via Stripe based on subscriptions, with the option of one time payments. We would like to commission a proof of concept for the Django integration with Stripe as described below: We will provide access to a basic Django set up that just implements basic user authentication using django-allauth. [login; logout; successfull login takes the user to a home page]. Can you integrate it with Stripe, perhaps by extending dj-stripe (you can develop in your own dev environment and deploy here), such that: 1) Creation of a new user results in the creation of a Stripe payer profile. The user profile has a field called valid_payment_method which is initially set to false. 2) Add a Profile page where the user can add a credit card or change the credit card on file. When the user provides a credit card that Stripe is ok with, valid_payment_method is set to true. If no valid payment option currently exists [e.g. if the user deletes all credit cards on file] then valid_payment_method is set to false. Whenever a user logs in, if valid_payment_method = false, the user is redirected to the Profile page and asked to provide a valid credit card. 3) Add a Product Subscription page where the user can toggle between one of three subscription packages and a "Cancel" option. Billing is done on the first of every month (assuming the subscription has not been canceled). The amount billed equals the cost of the package that was subscribed to for most of the preceding month. If the user selects the Cancel option, the user profile is set to inactive and a prorated due amount is stored in outstanding_amount. If a scheduled payment did not go through, valid_payment_method is set to false and outstanding_amount is incremented with the scheduled payment amount. 4) Add a Billing History page which shows all payments that have already gone through. If possible, also show next scheduled payment. 5) Add a One Time Payment page providing a one time payment option. User can select the amount, but if there is an outstanding payment due, then there is a message on top indicating such and the default amount equals the outstanding payment due. Also, if there is an outstanding payment due, then upon login the user is redirected to this page. If the user pays the outstanding amount and the user account was inactive (because the user had cancelled) then the user account is set to active status. If you are interested please let us know: -When you are available to begin -How long do you estimate this project will take to complete -Fixed cost estimate -Interim milestones to completion of which payments will be linked