* We improved the initialization of SDK making it easier to understand the available options.
* Now `NAS` accounts are the default instance for the SDK and `ABC` structure was moved to a `previous` prefixes.
* If you have been using this SDK before, you may find the following important changes:
** Imports: if you used to import `checkout_sdk.payments.payments` now use `checkout_sdk.payments.payments_previous`
** Marketplace module was moved to Accounts module, same for classes and references.
** In most cases, IDE can help you determine from where to import, but if you're still having issues don't hesitate to open a ticket.
Marketplace API name change
Marketplace terminology was removed from Checkout API Reference, so in order to matches what API reference contains we migrated all the MarketplaceClient stuff into AccountsClient
Decoupled Balances and Transfers from Marketplace/Accounts into his own clients BalancesClient and TransfersClient