// GET the list of products from this product catalogue
String catalogueId = "catalogueId"; // Your product catalogue Id
Filter filter = new Filter();// filter options (name, externalId, barcode value, product category name, barcode type, currency, amount range, page, size and sorting)

accept.inventory().getProducts(catalogue.getId(), new Filter())
                .subscribe(products -> {
                    // list of category products
                    }
                }, throwable -> {
                    handle error
                });

// GET product from with given product ID inside catalogue with given catalogue ID
accept.inventory().getProduct("catalogueId", "productId")
        .subscribe(product -> {
            // product object
        }, throwable -> {
            // handle error
        });