Regarding:

• Does Flow need Abstraction
• Throw Exception or Return Status value
• Custom Exception
• Use Transaction
• Retry/Re-Processing

香港，银行间转账场景。HKITL (Hong Kong Interbank Clearing Limited) 提供了两种清结算方式。CHATS 和 FPS。

中国，银行间转账场景。

my initial understanding of system resilience.

good news is from the spring framework itself, we have these resilience capabilities.

As of 7.0, the core Spring Framework includes a couple of common resilience features,
in particular @Retryable and @ConcurrencyLimit annotations for method invocations.

another good resource is resilience4j.

总结一下项目：代理和信托。

代理涵盖帮助投资机构/投资者买卖证券，收益归投资者。

信托涵盖财富管理，收益归约定的受益人。

RestClient Official Document

The RestClient is a synchronous HTTP client that offers a modern, fluent API. It offers an abstraction over HTTP libraries that allows for convenient conversion from a Java object to an HTTP request, and the creation of objects from an HTTP response.

Lets see how it is designed.