New creates a new Server utilising the given StorageType to handle Payment storage, and sets up the HTTP router.

NewWrapper will return a new ReadWrapper.

InMemory describes a storage system that is held in memory only, and not persisted to disk.

Mongo describes a storage system that persists Payment records in a MongoDB database.

ReadWrapper adds some extra information around Payment structs that are read from the API.

Server is a RESTful HTTP API server offering CRUD functionality to store Payments.

StorageType is an enum to differentiate between storage implementations.