v0.2.1

Changes

Models

• Add SubscribeCallbackRequest and SubscribeCallbackResponse.
• Add UserCallbackEvent - UserActivated
• Add CashCallbackEvent - CashAccountActivated and DepositSettled

APIs

• Add UserApi. postApiV1UserEvents()
• Add CashApi.postApiV1CashEvents()

Misc

• Add SigningUtils
• Add CallbackUtils