import type { IdentityAssertionProvider } from '../../domains/fiat/identityAssertion';
import type { FunLogger } from '../../utils/funLogger';
export interface CheckoutClientSecretParams {
    apiKey: string;
    logger: FunLogger;
    /** `POST /fiat/orders/{orderId}/checkout`, taken whole from the surface. */
    callbackEndpoint: string;
    /** The body key the surface named for the callback id. */
    callbackIdField: string;
}
/**
 * One turn of Stripe's `performCheckout` loop, which Stripe re-enters per attempt (a 3DS challenge
 * is another one). One fresh callback id per invocation, stable across transport retries of that
 * same attempt: the backend spends it as the Stripe idempotency key, so a shared one collapses two
 * attempts into one charge and a changing one can double a single attempt.
 *
 * Not a transition: the flow does not advance between attempts.
 */
export declare function requestCheckoutClientSecret({ apiKey, logger, callbackEndpoint, callbackIdField, }: CheckoutClientSecretParams, identityAssertionProvider: IdentityAssertionProvider | undefined): Promise<string>;
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