An improved Sandbox with customizable accounts

The Sandbox environment has been updated with new features based on user feedback, including customizable accounts and metadata, a broader dataset of transactions, and triggerable webhooks for testing purposes. Users can now modify account details such as type, subtype, balance, and currency to fit their testing needs. Additionally, the transaction data in the Sandbox environment has been improved to represent a wider range of merchants, descriptions, and account types, with updated amounts to better resemble production traffic. The new /sandbox/item/fire_webhook endpoint allows users to trigger and test transactions webhooks on demand for an Item via its access token. Further improvements are planned for the Sandbox environment to enable more use case testing and refinement of applications.