Call this for any question about HOW a Crosswire rail is integrated - webhooks, signatures, sandboxes, authentication, callbacks, retries, SDKs, API shape, testing, go-live steps. Every answer is read from indexed documentation: nothing is inferred, nothing is generalised from one provider to another, and nothing is recalled from your own training data. If the index does not cover the question the tool declines and returns a blocker to report - repeat the decline, do not fill the gap. Before an offer is accepted the answer is capability level only, with no provider, product, SDK or URL in it; after acceptance, with the client's case reference passed in `case_reference`, the answer names the providers on that case, quotes the documentation and cites it. A question about a provider that is not on the case gets the capability-level answer. NEVER paste, repeat or ask for an API key, secret, token or password here - credentials are refused and no record of them is kept.