/**
 * Redact Merit/Stripe credentials and request signatures from a string. Defensive —
 * used in error envelopes that may echo back fragments of request URLs, bodies, or
 * upstream responses. Scrubs:
 *   - MERIT_API_KEY / MERIT_API_ID / STRIPE_API_KEY env assignments
 *   - apiId / apiKey / signature query-string parameters
 *   - apiId / apiKey / api_key / signature in JSON/object bodies
 *   - `Authorization: Bearer <token>` headers (Stripe keys)
 *   - bare Stripe key tokens (sk_/rk_/pk_/whsec_...) in any position
 */
export declare function redactSecrets(text: string): string;