Product design question

Anthropic wants one account and one wallet across Claude subscriptions and the API. Define the MVP user journey from first signup to first production invoice, including the account model, plan or wallet behavior, and migration path for existing users. What tradeoffs would you make to maximize activation without creating unacceptable billing or identity risk?

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What this question tests

Ability to design an account and billing unification MVP with a clean migration path and a clear activation versus risk tradeoff.

Define the account model: a single identity that can hold both a subscription, Claude.ai, and a wallet based balance, API usage, rather than two disconnected account types.
Map the MVP user journey: signup creates one account, the user can add a subscription, fund a wallet, or both, and usage across both draws from the appropriate balance without requiring a second signup.
Define plan and wallet interaction rules for the MVP simply, for example subscription covers Claude.ai usage while API usage draws from the wallet, deferring more complex blended billing to later.
Design the migration path for existing separate subscription and API accounts, defaulting to a prompted, opt in merge rather than a forced silent migration, to avoid billing surprises.
Address identity risk by requiring re authentication or verification before merging accounts with different payment methods or billing history.
State the tradeoff: an opt in migration is slower to reach full unification but far lower risk than an automatic merge that could double bill or misattribute usage.

Keeps the v1 plan and wallet interaction simple and explicit rather than trying to solve every blended billing edge case at once.
Chooses an opt in migration path explicitly to avoid the biggest risk, incorrectly merging billing histories or payment methods.
Names the activation versus risk tradeoff plainly, opt in is slower but safer.
Addresses identity verification specifically as a safeguard during migration.

Proposing an automatic silent merge of existing accounts, which risks billing errors and user trust.
Overscoping v1 with complex blended billing rules instead of a simple initial interaction model.

How would you handle a user who has two separate accounts with different payment methods already on file?
What would you measure in the first month to know the migration path was working?