Core concepts

How the SDK models clients, end users, and food data.

• Runtime and security boundaries: where January calls can run, and which credential each place uses.

• Client lifecycle: one client per signed-in user, and when to replace it.

• User identity and timezone: the end-user ID, the timezone, and how calendar days work.

• Food discovery and servings: from search to a food with servings to a portion you can log.