code: @NotNull
      public SkuManager mapSku(String sku, @Nullable Map<String, String> storeSkus) {
          if (storeSkus == null) {
              throw new SkuMappingException("Store skus map can't be null.");
          }
  
          for (Map.Entry<String, String> entry : storeSkus.entrySet()) {
              mapSku(sku, entry.getKey(), entry.getValue());
          }
          return this;
      }
docs: Maps a base internal SKU to a store-specific SKU.
  The best approach is to use SKU like <code>com.companyname.application.item</code>.
  Such SKU fits most of stores so it doesn't need to be mapped.
  If this approach is not applicable, use application internal SKU in the code (usually it is a SKU for Google Play)
  and map SKU from other stores using this method. OpenIAB will map SKU in both directions,
  so you can use only your internal SKU
  
  @param sku       - The application internal SKU.
  @param storeSkus - The map of "store name -> sku id in store"
  @return Instance of {@link org.onepf.oms.SkuManager}.
  @throws org.onepf.oms.SkuMappingException If mapping can't done.
  @see org.onepf.oms.SkuManager#mapSku(String, String, String)