Virtual account responses project bank fields to the root

What's new — GET /v1/virtual-accounts/{id} now exposes bank-account fields at the response root, in addition to the nested source_deposit_instructions. Newly available at the root: account_holder_name, account_number, routing_number, bank_name, bank_address, account_holder_address, swift_bic, methods, and a markup echo.

Impact — Additive. The nested source_deposit_instructions object is unchanged and remains the canonical location for backward compatibility. Update integrations to read from the root if you prefer a flatter shape.

Reference — GET /v1/virtual-accounts/{id}