Validate a corporation formation request
⚠️ Early access — This endpoint is in preview and may change in backwards-incompatible ways before it is marked stable. Avoid depending on it in production, and reach out before building on it.
Runs the same compliance validation as the corporation formation endpoint without creating a filing or business record.
Accepts a partial or complete formation payload and returns every compliance error in one pass — useful for pre-flighting a submission. Jurisdiction-specific fields are accepted exactly as on the create endpoint (additional top-level properties, plus jurisdiction_registered_agent / jurisdiction_stock_structure for state-specific subfields); call GET /v1/filing/formation/requirement to discover what a given jurisdiction expects.
Note: DTO-level constraints (e.g. contact shape) are not checked here — they apply on the real create.

