In large eCommerce platforms such as Amazon, eBay, Taobao, or AliExpress, integrating diverse systems $($e$.$g$.,$ payment, shipping, and seller management$)$ is crucial for smooth operations. These platforms must handle various challenges such as currency differences, multiple payment options, and different shipping methods.

Based on your understanding of Enterprise Application Integration $($EAI$)$ and your experience with these or similar eCommerce platforms, perform the following:

Create a EAI System Architecture Diagram for one platform of your choice, showing the critical integration layers.

explain the following:

How data integration is handled across different systems, giving a personal example where you encountered challenges or successes.

How application integration connects systems like payment and order management, using one specific example from your own experience.

Reflect on how the platform simplifies complex processes for users and provide a personal example where the platform excelled or failed.