/** Czech bank code (4 digits) from positions 5–8 of a CZ IBAN, or null. */
export declare function extractCzBankCode(iban: string): string | null;
export interface FioEligibleBankAccountInput {
    iban?: string | null;
    bankCode?: string | null;
}
/**
 * FIO Bank eligibility — CZ bank code 2010 only (FD-25: IBAN-derived code wins).
 */
export declare function isFioEligibleBankAccount(input: FioEligibleBankAccountInput): boolean;
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