Sequential API Calls with Callbacks

You are tasked with building a system that performs a series of actions for user onboarding. Each action requires calling an API in a specific order. Each API should only be called after the previous one has completed successfully.

The sequence of API calls is as follows:

  • createAccount - Sets up a new user account.
  • verifyEmail - Verifies the user's email address.
  • setupProfile - Sets up the user's profile.
  • sendWelcomePackage - Sends a welcome package to the user.

Each API function takes a callback as an argument, which should be called after the API action completes.

Instructions:

  • Write a function onboardUser that performs the four API calls in the specified sequence.

  • Make sure that each function waits for the previous one to complete before starting.

  • You may assume that createAccount, verifyEmail, setupProfile, and sendWelcomePackage are all provided and take a callback as their argument.

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