interface GenerateParams {
    action: string;
    scope: string;
    resource?: string;
    context: 'new_approval' | 'reconfirmation';
}
interface VerifyResult {
    valid: boolean;
    nonce?: string;
    context?: 'new_approval' | 'reconfirmation';
    error?: string;
}
export declare class ApprovalTokenService {
    private static readonly MAX_NONCES;
    private readonly secret;
    private readonly ttlSeconds;
    private readonly usedNonces;
    constructor(ttlSeconds?: number);
    generate(params: GenerateParams): string;
    verify(token: string, expectedAction: string, expectedResource?: string): VerifyResult;
}
export {};
//# sourceMappingURL=approval-token.d.ts.map