/**
 * Promo checkout handoff SSOT (ADR-006 / plan §3.8).
 *
 * Server session metadata wins over sessionStorage. FE overwrites handoff from
 * apply/activate responses; payment create reads server first.
 */
export declare function promoActivatedRewardStorageKey(tenantCode: string, checkoutSessionId: string): string;
export declare function readPromoActivatedRewardHandoff(tenantCode: string, checkoutSessionId: string): string | null;
export declare function setPromoActivatedRewardHandoff(tenantCode: string, checkoutSessionId: string, activatedPromoRewardId: string): void;
export declare function clearPromoActivatedRewardHandoff(tenantCode: string, checkoutSessionId: string): void;
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