Take this into a real integration

Use the scenario and expected outcome as a starting test case. Replace fictional inputs with an authorised provider adapter, define the source of truth, and preserve the failure behaviour.

Every quote, timing, balance, provider and receipt here is fictional. Deterministic browser logic only: no AI model, wallet, bank API, blockchain, custody or real funds. Reloading clears state. No financial advice, guaranteed execution, investment return, compliance certification or audit. Production requires durable storage, authenticated events, concurrency controls, provider contracts and jurisdiction-specific review.