Synchronous lookup by exactly one of: autocompleteResultId, names plus addresses, tin, or websiteUrl. A null profile means no match. When looking up a typed EIN, the returned tin object (tinType, tin, lastFour) is for checking it; it never replaces the EIN the applicant enters, and entity create still requires the full typed EIN. Each call is billed. Results are unverified commercial data (dataClassification unverified_commercial_data) for filling onboarding forms. They never verify a business, change CIP, or feed KYB decisioning.