By following this guide, you will have a fully functional Shopify app. However, there are some things you should be aware of before using your new app in a production environment.
Before you start writing your application, please note that the Shopify library stores some information for OAuth in sessions. Since each application may choose a different strategy to store information, the library cannot dictate any specific storage strategy. By default, Shopify.Context is initialized with SQLiteSessionStorage, which will enable you to start developing your app by storing sessions using the file-based SQLite package. You can quickly get your app set up using it, but please keep the following in mind.
MemorySessionStorage is purposely designed to be a single-process, development-only solution. It will leak memory in most cases and delete all sessions when your app restarts. You should never use it in production apps.
SQLiteSessionStorage (the library default) is designed to be a single-process solution and may be sufficient for your production needs depending on your applications design and needs.
The other storage adapters (MongoDBSessionStorage, MySQLSessionStorage, PostgreSQLSessionStorage, RedisSessionStorage) cover a variety of production-grade storage options.
If you wish to have an alternative storage solution, you must use a CustomSessionStorage solution in your production app- you can reference our usage example with redis to get started.