What is Service Contracts ? By Sudhanshu Bajaj on Friday, February 7, 2020 A What is Service Contracts ? A service contract is a set of PHP interfaces that are defined for a module. These service contracts are stored in the app/code/VendeorName/ModuleName/Api/ directory and Data interfaces resides in app/code/VendorName/ModuleName/Api/Data. Category: Basics Next Post