Make packages/medusa/src/api/routes/store/returns pass linting

In an effort to improve our code quality we want to make sure that all files in the repo pass linting.

Please see this guide for a step-by-step guide for how to complete this task: https://medusajs.notion.site/Linting-routes-challenge-80bdf849c27a4d65baf9d397544d4a60

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Our current documentation for using templates points users to the JSON output to learn about what data is available to the template author. This is insufficient, because although it currently describes the correct shape of data, it leaves users guessing at the correct casing for field names.

A better source of truth than the JSON output is the

It appears there are quite a few http:// links in the documentation and code comments of this project despite the target websites supporting HTTPS (sometimes HTTPS has to be explicitly requested because the website does not upgrade connections on its own).

A quick search for http: yielded about 4000 findings, however I assume a lot are false positives (e.g. because they are part of an XML n

React version: 17.0.1

Steps To Reproduce

1. npx create-react-app my-app
2. cd my-app
3. npm start (Works like a charm)
4. npm run eject
5. npm i
6. npm start (ReferenceError: React is not defined)

Link to code example: https://codesandbox.io/s/ecstatic-wood-ou6px

It would be ideal to be able to identify and catalog Nix packages.