const STORAGE_KEY = 'stb:last-payment-link';

type StorageLike = Pick<Storage, 'getItem' | 'setItem'>;

export function readCachedPaymentLink(storage: StorageLike): string | null {
  return storage.getItem(STORAGE_KEY) || null;
}

export function writeCachedPaymentLink(
  storage: StorageLike,
  link: string,
): void {
  storage.setItem(STORAGE_KEY, link);
}