Multiple API changes

[remi-stripe]

Multiple API changes

• ⚠️ Types are now for the API version 2020-08-27. This is a breaking change for TypeScript users
• Removed authenticated and succeeded on payment_method_details[card][three_d_secure] on Charge
• Removed tax_percent and prorate across all Billing APIs
• Renamed plans to items on SubscriptionSchedule
• Removed display_items on Checkout Session
• Removed save_payment_method and source on PaymentIntent confirm, create and update. Those parameters still work in the API but are removed from the library
• Removed payment_method_details[bitcoin] on Charge
• Removed unified_proration on Billing API as this is a deprecated feature that never shipped publicly
• Removed plan and quantity from Subscription, use items instead
• Removed requested_capabilities on Account creation, use capabilities instead
• Removed failure_url and success_url from AccountLink, use refresh_url and return_url instead
• Removed invoice.payment_succeeded and payment_method.card_automatically_updated events.

Codegen for openapi 2aeb1a7

r? @richardm-stripe
cc @stripe/api-libraries

[DiegoRBaquero]

Why is this not a semver major?

[remi-stripe]

@DiegoRBaquero Changes to the Typescript definitions are not considered breaking today and don't involve a major version with semantic versioning. We do a major version when we change the library's internals or remove API methods or API resources for example.