# Cart Service

Provides a high-performance, extensible cart that holds products for later checkout.

### Key features and benefits

* Supports authenticated user carts
* Merges carts seamlessly
* Provides a single cart across sites or an individual cart per site
* Makes the cart persistent for later checkout
* Allows adding, removing, modifying, and deleting cart entries
* Supports products with unknown weight at checkout
* Calculates prices with high precision, up to 16 digits (ranging from 1 quadrillion (1,000,000,000,000,000) to 0.000000000000001, scale of 15)
* Supports multi-currency with appropriate format (no fractions, ISO standard defined fractions, or custom fractions)
* Supports promotions and discounts
* Supports coupons
* Handles deposits and fees
* Supports net and gross prices
* Offers high-performance, auto-scaling capabilities
* Handles external prices and fees
* Provides a ready-to-use cart implementation
* Guarantees response times and high availability
* Supports web, native/reactive mobile, gaming consoles, and other IoT devices