Q:
A company uses Dynamics 365 Finance.

The company wants to expose the product price through a web service for external applications to consume.

You need to create a JSON-based custom service.

Which Application Object Tree (AOT) element should you use?

Select only one answer.

Answer: A

Explanation:

The correct answer is:

To expose a JSON-based custom web service in Dynamics 365 Finance, you need to:

Create a service class and expose it through a Service group AOT element.

A Service group:
- Is used to publish custom services to be consumed externally.
- Supports RESTful endpoints and returns data in JSON format.
- Can contain one or more Service classes (with [SysODataAction] or [SysODataCollection] attributes).

This is the correct approach when you need custom business logic exposed to external applications through JSON-based APIs.

Data entity
❌ Used for data import/export and OData endpoints, but not suitable for custom logic or service operations.
Provider
❌ Not a specific AOT element used for creating custom JSON services.
Macro
❌ Used for compile-time constants or conditional code, unrelated to services or integrations.

✔ Service group

Custom Service Creation in D365 F&O

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