Build out shopify for subscription management

[griebelr]

Key features that must be supported:

1. Create and maintain subscriptions
   • Set up payment schedules based on selected billing cycle (monthly, quarterly, annual)
   • Set up subscription renewal date based on purchase date
   • Set up subscription expiration date based on purchase date
2. Email payment statements after auto draft payments are complete
3. Email renewal notices
4. Email subscription expiration notices
5. Ability for customer to view and print payment statement
6. Ability for customer to change payment method
7. Ability for customer to change billing cycle
8. Ability for customer to cancel subscription
   • Automatically enforces 30-day money back guarantee (if purchase date is within 30 days of cancellation request AND no closed reservation, then process refund)
9. Reporting