- Getting Started
- Creating Your First Funnel
- CartFlows Funnel Step Types
- Starting a Funnel from a Product Page
- How to Edit and Customise Funnel Steps
- Using CartFlows with or without Store Checkout
- How to Add /Assign Products to a Checkout Step
- How to Create One-Click Upsell and Downsell Offers
- How to Use Canvas Mode to Visualize Your Sales Funnel
- Hiding Fields on the Checkout Page
- Installing WooCommerce
- Using WooCommerce
- Adding Products in WooCommerce
- Using Your Theme's Header & Footer in a Step
- Embedding a Checkout Form on the Checkout Page
- Hiding WooCommerce Pages and Products
- Using Pricing Tables
- Adding an Affiliate Program
- Setting a Funnel as the Homepage
- Dynamic Offers aka Rule Engine
- Instant Layout for Checkout and Thank You Step
- Adding Products from the URL to the Checkout Page
- Deleting Plugin Data During Uninstallation
- Importing Ready-Made Templates for Funnels and Steps
- Importing and Exporting Funnels and Step
- URL Parameters
- Replacing the Main Checkout Order with an Upsell or Downsell
- Rolling back to a Previous Version
- Using the "Order Custom Field" Rule of Dynamic Offers with Custom Field Editor
- Google Address Autocomplete
- Flatsome UX Builder
- ActiveCampaign
- Paypal Reference Transactions
- How PaypPal/Stripe Works
- Enabling Enfold Avia Layout Builder
- Setting Up Authorize.net for Upsell & Downsell
- Supported Payment Gateways
- Setting Quantity and Discount for Products on the Checkout Page
- Adding Custom Payment Gateway Support for One-Click Upsell and Downsell
- Funnel in Test Mode
- Troubleshooting Plugin and Theme Conflicts
- Resolving the "Please Select a Simple, Virtual, and Free Product" Error
- Fixing Endless Loading on the Checkout Page
- Fixing the "We can't seem to find an order for you." Error on the Thank You Page
- Troubleshooting License Activation Issues
- Fixing the "Checkout ID Not Found" Error
- Fixing the "Session Expired" Error Message
- Resolving "Order Does Not Exist" Error on Upsell/Downsell Page
- Fixing the "Sorry, This Product Cannot Be Purchased" Error
- Disabling Auto-fill of Address Fields Based on Zip Code
- Enabling Theme's Scripts & Styles Without Changing Page Template
- Disabling Auto-fill of Checkout Fields
- Allowing Cache Plugins to Cache CartFlows Pages
- Changing the "Choose a Variation" Text
- VAT Field Not Displaying for WooCommerce EU/UK VAT Compliance Plugin
- Enabling the Product Tab on Store Checkout
- Displaying the Order Summary Open on Mobile Devices
- Refreshing the Checkout Page After CartFlows AJAX Calls
- Overview
- Installing Modern Cart Starter
- Installing Modern Cart Pro
- Activating License Key
- Customizing General Settings
- Customizing Cart Tray Labels
- Customizing Cart Icon Settings
- Customizing Cart Tray Styling
- Understanding the Product Recommendations Feature
- Controlling Product Recommendation Source for Empty Cart
CartFlows Instant Checkout
CartFlows Pro includes a feature called Instant Checkout that lets shoppers buy a product straight from the product page, without ever leaving it. A Buy Now button appears next to your existing Add to Cart button, and clicking it opens the full checkout, order bumps and all, in a popup right there on the page.

This guide walks you through how Instant Checkout works, where you can turn it on, and what the experience looks like for your shoppers.
How Instant Checkout Works
When Instant Checkout is turned on for a funnel, CartFlows automatically adds a Buy Now button next to Add to Cart on that funnel’s product page. Nothing needs to be placed manually.
- The shopper clicks Buy Now, and a checkout popup opens right on top of the product page. Their browsing cart is set aside for the moment, not lost.
- Inside the popup, they move through checkout, review any order bumps, and pay, all without a single page reload.
- If they close the popup without finishing, their original cart is restored exactly as it was. If they complete the order, the funnel’s upsell and downsell steps take over next, just like a normal CartFlows checkout.
Pricing shown in the popup is always calculated by your store, so shoppers are only ever charged what they were shown.
Where You Can Turn On Instant Checkout
You can turn on Instant Checkout in two places, depending on which products should get the Buy Now button:
- Store Checkout adds the Buy Now button to every product in your store, with no setup per product. How to set up Instant Checkout on Store Checkout
- A funnel assigned to a product gives specific products their own checkout, order bumps and upsells. How to assign a funnel to a product
You can use both together. To see which one CartFlows uses when both are set up, check Instant Checkout: Store Checkout vs. Assigning a Funnel to a Product.
Customizing the Popup
Wherever you turn it on, the Instant Checkout tab in the funnel settings lets you choose how the popup looks.

- Popup Layout: pick Two Pane for the full three-step checkout (contact, address, payment) with the order summary alongside, or QuickBuy for a compact single-column popup with a two-step checkout and the order total in a fixed strip.
- Button Text: reads “Buy Now” by default. Change it to match your store’s voice.
- Custom Logo: shown inside the popup. Leave it empty to use your site’s logo, or your store’s initials if you don’t have one set.
- Design: match the popup to your store, including the primary color, heading and text colors, background colors, and base font size.
The Instant Checkout Popup in Action
Once Instant Checkout is on, shoppers see the Buy Now button right next to Add to Cart on the product page.

Clicking it opens the popup without leaving the page.

Any order bumps you’ve set up on the funnel’s checkout step appear in the popup too, including quantity controls and, for variable products, the usual size or color options.

On Mobile Devices
The popup adjusts to fit smaller screens, keeping the same steps and order summary in a compact, full-width layout.

Working with Coupons
If you have Power Coupons installed, shoppers can enter a coupon code right inside the popup to apply any offers available to them, without leaving checkout.
Coupons applied inside the popup only apply to that purchase. If the shopper closes the popup without completing the order, their original cart and its own coupons come back untouched.
Frequently Asked Questions
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