```suggestion

[lampma]

schema | Describes the message structure. Use the Data Interface format from the Service Contracts. Besides, there is another way to specify a service method signature:`<module>\Api\<ServiceName>::<methodName>` (Magento\Customer\Api\CustomerRepositoryInterface::save).

Originally posted by @keharper in https://github.com/magento/devdocs/pull/8726#r581087171

[m2-assistant[bot]]

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