Stripe

* [809](https://github.com/stripe/stripe-python/pull/809) Release of major version v3.0.0. The [migration guide](https://github.com/stripe/stripe-python/wiki/Migration-Guide-for-v3) contains more information.
(⚠️ = breaking changes):
* ⚠️ Replace the legacy `Order` API with the new `Order` API.
* New methods: `cancel`, `list_line_items`, `reopen`, and `submit`
* Removed methods: `pay` and `return_order`
* Removed resources: `OrderItem` and `OrderReturn`
* ⚠️ Rename `financial_connections.account.refresh` to `financial_connections.refresh_account`
* Add support for `amount_discount`, `amount_tax`, and `product` on `LineItem`

* [808](https://github.com/stripe/stripe-python/pull/808) API Updates
* Add support for new resources `FinancialConnections.AccountOwner`, `FinancialConnections.AccountOwnership`, `FinancialConnections.Account`, and `FinancialConnections.Session`

* [805](https://github.com/stripe/stripe-python/pull/805) API Updates
* Add support for new resource `CashBalance`

* [796](https://github.com/stripe/stripe-python/pull/796) API Updates
* Add support for `expire` test helper method on resource `Refund`

* [792](https://github.com/stripe/stripe-python/pull/792) [#794](https://github.com/stripe/stripe-python/pull/794) [#795](https://github.com/stripe/stripe-python/pull/795) API Updates
* Add support for new resources `FundingInstructions` and `Terminal.Configuration`

* [791](https://github.com/stripe/stripe-python/pull/791) API Updates
* Add support for `increment_authorization` method on resource `PaymentIntent`