Custom Subscriptions Module for Zoho

We are currently in the process of implementing Zoho CRM for a call centre for after market sales and require a custom module to be created in Zoho Creator. The custom module needs to do multiple tasks. - Allow the CRM user to click a link within a customer record to jump to create a new subscription. - Create a subscription invoice which will calculate payments over a period of varying months for the first year and then a regular 12 month period going forward. - The module should allow the option for the customer to make an initial down payment towards the subscription at which point the remainder will get spread across the remaining months. - Customers with a subscription should have an indicator within the CRM record. - Needs to generate the relevant invoices and automatically charge the card on file at regular intervals. Further details can be discussed to help provide a more accurate quote. Note that there is also a short timeline involved.