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• Abstract
• Status
• Table Of Contents
• Problem Statement
• Functional Requirements
• Introduction to Subscription Contracts
• Components of a Subscription Contract
  • Object Relationship Diagram
• Subscription Contract Life Cycle
  • Subscription Contract Statuses
• Create a Subscription Contract
  • Trial Period
  • Paid Subscription
  • Billing Cycle Anchor
• Modify a Subscription Contract
  • Change billing anchor
  • Update payment method
  • Upgrade and Downgrade
• Canceling a Subscription Contract
  • Cancel at the end of the billing period
  • Cancel due to exhausted payment attempts
  • Cancel due to expired incomplete state
• Billing Period Processing
  • Generates an order
  • Handle the payment
  • Create a new billing period
• Usage-based Billing
• Scanning for due subscriptions
• Temporal.io and the Subscription System
  • Why Temporal.io?
• Available Workflows
  • 1. Process Billing Period Workflow
  • 2. New Billing Period Workflow
  • 3. Payment Create Workflow
  • 4. Activate Trial Subscription Workflow
  • 5. Scan Due Subscriptions Workflow
• Handling Payment Results