Built forCS-CartAdd-ons for CS-Cart & Multi-Vendor, from an independent developer

One Step Checkout

by Kavio Labs · for CS-Cart & Multi-Vendor

One page checkout in 1, 2 or 3 columns with a sticky summary, one screen for every field and a safe fallback to the standard checkout.

Tested on 3 builds Updated Oct 31, 2026 Version 1.0.0 CS-Cart, Multi-Vendor 4.17.2 – 4.21.x No core file edits
Built forCS-Cart

What it does

For CS-Cart and Multi-Vendor stores that want a shorter, cleaner checkout without giving up the core one. Choose three columns, two columns or one narrow column and drag the checkout blocks where you want them. One screen lists all contact, shipping and billing fields with show, hide, required, order and width. The core blocks, form and order placement stay in place, so the add-ons you already use keep their place on the page. Multi-Vendor orders with several vendors get a summary grouped by vendor.

How it works

Install, set Preview link only, and open the preview from Design, One Step Checkout. Pick a layout, drag blocks, and set fields on the Fields tab. Tick any payment method that needs the standard page: customers who choose it switch to the standard checkout with that method selected and their typed data kept. When you are happy, set the page to Everyone. Tested with real orders on offline payment methods; online gateways were not run, so try yours in Preview first.

Features

  • Three layouts in one license: three columns, two columns or one narrow column
  • Drag checkout blocks between columns, blocks of other add-ons included
  • One screen for every field: show, hide, required, optional, order and width
  • Order summary that stays in view, with Place order and quantity buttons
  • Phone flow: closed summary at the top, bottom bar with total and Place order
  • Promo code box and order note stay closed until needed
  • Typed data survives a reload, and a deleted note stays deleted
  • Optional first and last name inputs, and no address for carts that need no shipping
  • Multi-Vendor summary grouped by vendor with each vendor's shipping method
  • Per-payment fallback, link to the standard checkout and Preview mode; no core changes

What you get

Packagekv_one_step_checkout-1.0.0.zip, installed through Add-ons → Manage add-ons
Updates & support12 months included. Download new versions from your account and install them in Add-ons → Manage add-ons or the Upgrade Center.
License1 production installation. Staging, dev and localhost are free and unlimited. The add-on keeps working after the update period ends. How licensing works
For developersUses 7 CS-Cart PHP hooks. No core files are changed.
Version
1.0.0
Updated
Oct 31, 2026
CS-Cart
4.17.2 – 4.21.x
Tested on
CS-Cart 4.17.2, Multi-Vendor 4.17.2, Multi-Vendor 4.21.2 (auto-tested)
PHP
7.4 – 8.3
Core edits
None
Add-on ID
kv_one_step_checkout
Developer
Kavio Labs Software Limited

Support

Policy
Bug reports
1 business day
How-to questions
2 business days
Channel
Tickets in your account

Frequently bought together

Add a released add-on to this order and save 15% on it. It uses the same edition and store domain.

One Step CheckoutThis add-on
Abandoned Cart Recovery ProWin back abandoned carts with up to three automatic reminder e-mails, one-click cart restore links and unique single-use coupons.
$69
Shipping Goal Progress BarShow shoppers how close they are to free shipping, a gift or a discount, with live progress in the mini-cart, cart, checkout and a sticky bar.
$39
Delivery Date & Time Slots"Order within 2 h, get it by Thursday" on every product page, and delivery day and time slot booking at checkout.
$79

Buy with confidence

What stands behind your license

  • Tested builds

    Every release is installed and run on these versions before it ships.

    • CS-Cart4.17.2
    • Multi-Vendor4.17.2
    • Multi-Vendor4.21.2
  • 12 months of updates

    Updates and support are included in the price. The product keeps working afterwards; renewing is optional.

    How licensing works
  • 30-day refund

    If it is not what you expected, tell us within 30 days and we refund the order.

    Refund policy
  • Secure checkout

    Card payments are processed by Stripe. Your card number never reaches our server.

    Ask a pre-sales question

Sold by Kavio Labs Software Limited, registered in England and Wales No. 17532441. About us

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