import type { StripeOnrampClient } from './stripeOnramp';
/**
 * Reads the contract's silent sign-in credential off a step response.
 *
 * It rides `FiatStepResponseBase`, not a surface: the backend mints it beside the pay sheet so the
 * client can wake its Link session without a round trip of its own. Absent means no silent path.
 */
export declare function stripeSeamlessClientSecret(response: object | undefined, now?: number): string | undefined;
/**
 * Redeems the credential against the device's SDK. Never throws.
 *
 * The SDK holds a Link consumer session separate from the grant our backend stores, and the two
 * diverge — see `logOut` on `StripeOnrampClient`. Redeeming here wakes that session before
 * `registerWalletAddress` asks for it, which is the failure this exists to prevent. It stays an
 * optimisation: a refusal means the buyer signs in interactively, not that payment stops.
 */
export declare function redeemStripeSeamlessSignIn(stripe: StripeOnrampClient, clientSecret: string): Promise<boolean>;
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