Adobe Commerce provides two primary, modern web APIs for third-party system integration: REST and GraphQL. Both are fully suited for integrating an inventory management system.

The REST API provides a comprehensive set of endpoints for managing all aspects of the platform, including Multi-Source Inventory (MSI). It is a conventional and robust choice for server-to-server integrations.

The GraphQL API is a modern, flexible alternative that allows clients to request precisely the data they need, which can be highly efficient. It also has full support for inventory queries and mutations.

Official Adobe Commerce documentation provides specific examples for managing inventory using both REST and GraphQL, confirming both are appropriate for this task.

B. gRPC: Magento (Adobe Commerce) does not provide native support for the gRPC framework. Therefore, it cannot be used for this integration out-of-the-box.

D. XWL-RPC: This is a typo for XML-RPC. The XML-RPC API was available in Magento 1 but was deprecated and completely removed in Magento 2 / Adobe Commerce.

1. Adobe Commerce Developer Documentation

"Inventory Management web APIs": This official guide explicitly demonstrates how to perform inventory management tasks

such as managing stock and sources

using both REST API calls (e.g.

POST /V1/inventory/source-items) and GraphQL mutations (e.g.

mutation { updateSourceItems(...) }). This directly supports that both A and C are correct.

Source: Adobe Commerce Developer Documentation > Inventory Management > Web APIs.

2. Adobe Commerce Developer Documentation

"Introduction to Adobe Commerce web APIs": This document introduces the available web APIs

focusing on REST and GraphQL as the primary integration methods for Adobe Commerce. It positions them as the standard technologies for interacting with the platform's resources.

Source: Adobe Commerce Developer Documentation > Web APIs > Overview.

3. Adobe Commerce Developer Documentation

"Deprecated features": This page confirms the removal of the XML-RPC API

stating

"The XML-RPC API library is not supported in Magento 2. The REST and SOAP APIs provide better scalability

and are more robust." This validates that option D is incorrect for the current platform.

Source: Adobe Commerce Developer Documentation > Get Started > Magento Technology Stack > Deprecated features.