Magento 2 Extension Attributes: Add Data to Orders and APIs
Add custom data to Magento 2 entities with extension attributes: extension_attributes.xml, repository plugins, storage, REST output and the usual pitfalls.
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Articles about Service Contracts
2 articles
Magento 2 Service Contracts and Repositories Explained
How Magento 2 service contracts and repositories work: data interfaces, getList with SearchCriteria, building your own repository and when to skip it.