Issue calling the unitofwork endpoint: "body must have required property 'data'" #3

When following the Getting Started guide, in the step where we call the Heroku API from APEX, when we execute the unitofwork call we get the following error:

InvokeHerokuAPI.postUnitOfWork();

FAILED!: 400 {"statusCode":400,"code":"FST_ERR_VALIDATION","error":"Bad Request","message":"body must have required property 'data'"}

The problem is that the index.js that handles the route for unitofwork is expecting the payload to have a "data" node:

However, the api-spec.yaml does not specify the same payload format:

Since dynamic Apex classes are based on the api-spec.yaml definition, there's no "data" attribute on the HerokuAPI_UnitOfWork_IN_body class.

Either the api-spec.yaml or the route logic in index.js needs to be modified to use the same payload definition. I suspect that it would be easier to modify the logic in index.js since all other modifications would require changing the Apex code in the Getting Started guide.