Exam Certified Integration Architect topic 1 question 44 discussion

C is the most suitable. B is the less suitable as a user can click many time and you never explain to everyone that they shouldn't do this.

Why Other Options Are Less Suitable: A. Outbound Messaging, which will automatically handle error retries to the service: While Outbound Messaging handles automatic retries, it has limitations in terms of customization and error handling. It may not provide the granular control required to ensure exactly-once delivery. B. Button press invokes synchronous callout, with user handling retries in case of error: Relying on a user to handle retries introduces the risk of human error and does not guarantee that the order will be processed exactly once. This approach lacks the automation and reliability required for critical financial transactions. D. Trigger makes @future Apex method, with custom error handling process: @future methods have limitations, such as not being able to chain jobs or manage complex operations as effectively as Queueable Apex. They also do not provide the same level of control and monitoring capabilities.

You probably cannot do B as it will allow the user to smash the button as many times as they want.

The question does not specify that it must be automated, only that it should be sent once as the most highest priority item. Adding my vote that it should be B

Due to the critical nature mentioned in the question, it would make sense for this transaction to be synchronous so that if there any failures, it can be rectified immediately. The rest of the options are Async, which does not take into the consideration of the criticality.

It says It is critical that each order reach the finance application exactly once for accurate invoicing. So I think it is B, because users can handle error immediately when there is an error to make sure it reaches the finance system

outbound messaging does not accept multiple objects

Outbound Messaging