v9.15.0-beta.1

• #1485 API Updates for beta branch
  • Updated stable APIs to the latest version
• #1483 API Updates for beta branch
  • Updated stable APIs to the latest version
  • Add QuotePhase resource
• #1479 API Updates for beta branch
  • Updated stable APIs to the latest version
  • Add Price.migrate_to property
  • Add SubscriptionSchedule.amend method.
  • Add Discount.subscription_item property.
  • Add Quote.subscription_data.billing_behavior, billing_cycle_anchor, end_behavior, from_schedule, from_subscription, prebilling, proration_behavior properties.
  • Add phases parameter to Quote.create
  • Add Subscription.discounts, prebilling properties.

See the changelog for more details.