Also called: E-commerce platform, Shopping cart
What shopping cart software is
Shopping cart software is the online store feature that lets customers select products, adjust quantities or options, apply discounts, review their order, and continue to checkout. It connects browsing to a completed order, with the cart calculating items, shipping, discounts, and taxes before payment.
A basic cart handles product selection and totals. More developed systems also manage inventory, coupon rules, customer and order records, and abandoned-cart reminders. The distinction matters: shopping cart software focuses on the purchase flow, while an e-commerce platform can also provide the storefront and broader store management.
A low monthly plan price tells you little until you add platform charges, add-ons, and payment processing.
How it works
When a shopper adds an item, the cart tracks the product, quantity, and price. At checkout, it collects order and delivery details, calculates the final total, then hands payment details to a payment gateway or connected checkout. The cart coordinates the order; it does not automatically determine the card processing rate.
Hosted carts run on a platform that manages the software, hosting, and updates. With a custom or self-hosted cart, your business controls more of the design and logic, but also takes on developer work, maintenance, and security updates as payment methods and browser requirements change.
What it means for your costs
Budget for the cart or platform plan, paid add-ons, and development or maintenance. Plans can charge more as your catalog or traffic grows, and features such as advanced shipping rules, subscription billing, or B2B pricing can require add-ons. Illustrative: a $20 monthly add-on costs $240 over 12 months, before processing fees.
Payment costs are a separate part of the total. Your payment processor charges for accepting payments, and some cart platforms also add a transaction fee on top. Compare both charges, plus hosting and developer work, across 12 to 24 months rather than choosing by the advertised plan price alone.
Where checkout goes wrong
Unexpected shipping, tax, or service charges at the final step give shoppers a reason to abandon the order. Show a shipping estimate or a clear note that shipping is calculated at checkout. Keep guest checkout available, make the checkout button easy to find, and test the cart on a phone.
Before choosing a cart, confirm that it supports your payment methods, mobile checkout, tax and shipping needs, and the gateway you use. Hosted software reduces the hosting and update work your business handles, but it does not remove your responsibility to meet applicable PCI DSS requirements.
Where the costs show up
There is no standard merchant-statement line for shopping cart software. Review the platform invoice for plan, add-on, and platform transaction charges, then compare your merchant statement for payment-processing costs. If a platform transaction charge appears on a processor statement, check its description and confirm whether it is separate from the processor markup.
What you can actually change
- Price the full stack. Add the platform plan, add-ons, processing costs, hosting, and expected developer work over 12 to 24 months. Include any extra transaction fee charged by the platform.
- Test the checkout. Place a test order on a phone and confirm that shipping, tax, discounts, and the final total are clear before payment.
- Check payment fit. Confirm gateway support, guest checkout, and the payment methods your customers use. Review the platform invoice and merchant statement separately so you can identify each charge.
Frequently asked questions
Does shopping cart software include payment processing?
Not necessarily. Cart software manages the shopping and checkout flow, while a payment processor or gateway handles payment acceptance. Some platforms add their own transaction fees, so compare those charges separately from processing fees.
Is shopping cart software the same as an e-commerce platform?
No. Shopping cart software focuses on product selection, order totals, and checkout. An e-commerce platform can also include storefront tools and broader store management, such as catalog or inventory features.
Does shopping cart software appear on a merchant statement?
There is no standard statement descriptor for cart software. The platform plan and add-ons are often billed separately from payment processing. Review your platform invoice alongside your merchant statement, and identify any platform transaction charge listed with processing costs.
Does a hosted cart eliminate PCI DSS responsibilities?
No. Hosted carts can reduce the security and maintenance work your business handles, but they do not remove your responsibility to meet applicable PCI DSS requirements. Confirm which parts of compliance the hosted service supports.