Build a subscription site

This site calculates many proprietary stock indicators, and the subscribers access them after logging in. As an example, let's say it calculates the moving average, and 52-weeks high. The workflow is simply: The subscriber logs in, chooses a few parameters (eg which stock, what period of stock history to use, what indicators to calculate), presses a button, and the result is displayed after checking that the subscriber has a valid subscription. Specific components: 1. A secured database to store details of subscribers: name, emails, subscription status, preference, etc. 2. A secured database to store stock data (common to all subscribers) 3. Subscription page: credit card processing using Stripe I need to be able to see all the code. And I need full support to show me how I could modify the components after project completion.