Release v1.4.0

New Features

• Implement the Cart API.
• Implement the Cart Items API
• Implement the Cart Redirect URLS API
• Allow the use of parameters in ProductsApi::Get.

Here's an example using PHP 8:

$product = $api->catalog()->product(123)->get(include_fields: ['description', 'sku'])->getProduct();

Bug Fix

Fix issue with ProductVariant::sku_id not being nullable #47 (thanks @Yorgv)