Add Relayed Authorisation Webhooks

[gcatanese]

Add support for Relayed Authorization Webhooks

[gemini-code-assist]

Summary of Changes

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This pull request integrates support for Adyen's Relayed Authorization Webhooks, a crucial feature for handling real-time authorization decisions within the Balance Platform. It involves the addition of a complete set of data models and a specialized handler to parse and interpret these webhook notifications, ensuring that the system can effectively process and react to authorization requests and their outcomes.

Highlights

• New Webhook Support: Added comprehensive support for Relayed Authorization Webhooks, enabling the system to process and respond to these specific authorization events from Adyen's Balance Platform.
• Extensive Model Generation: Introduced numerous new Java model classes to accurately represent the data structures involved in Relayed Authorization Webhooks, including details for amounts, payment instruments, merchant data, and transaction outcomes.
• Dedicated Webhook Handler: Implemented a dedicated RelayedAuthorisationWebhooksHandler to facilitate the deserialization and processing of incoming relayed authorization webhook payloads.
• Enhanced Test Coverage: Expanded the existing webhook test suite with a new test case and mock JSON payload to ensure the correct functionality and deserialization of the new Relayed Authorization Webhooks.

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[gemini-code-assist]

Code Review

This pull request adds support for Relayed Authorisation Webhooks by introducing a new set of auto-generated model classes and a handler. The changes look good overall, and a test case for the new webhook has been added. I've identified a few minor issues in the generated code and the handler that could be improved for better code quality and clarity.