[2026 Edition] Shopify Postpaid Payment App Comparison: 5 Recommended Options

In the latest version of Shopify store management in 2026, diversifying payment options is a crucial factor in determining customer experience and conversion rates. Postpaid payments, in particular, offer customers the peace of mind of being able to see the product in person before paying, eliminating psychological barriers for high-value items and first-time buyers. Offering flexible payment methods is key to staying competitive in modern e-commerce and reducing cart abandonment rates. In this article, we’ve carefully selected five of the most outstanding postpaid payment apps from the many available, providing a detailed ranking of their features and reputations. We’ll provide detailed information to help you choose the best app for your store and confidently increase your sales.

#1

Checkout Plus

App URL: View on Shopify App Store

App Overview

This app optimizes the checkout process and aims to improve conversion rates. It offers one-click checkout and upsell features.

App Details

Allows you to create your own checkout flow, significantly improving the customer experience. It is particularly focused on mobile usability and comes with a wealth of features to help prevent cart abandonment. It is highly customizable.

Reviews

Many customers report that after implementing the app, checkout errors decreased and sales stabilized. The app’s prompt support and high degree of design freedom are also highly praised.

The following are some user comments:

Since using this app, checkout errors have decreased and sales have stabilized. The support is also fast and helpful.

Although the Japanese language support is not perfect in some areas, it is multifunctional and easy to use. I particularly like the high degree of design freedom.

Installation was easy, but some settings were complicated, requiring manual reading. The results are impressive, so I’m very satisfied.

2nd place

Back in Stock: Restock Alerts

App URL: Shopify View in the App Store

App Overview

This app automatically notifies customers when out-of-stock items are back in stock. Recover missed sales opportunities.

App Details

Customers can register their email address on the out-of-stock product page, and an automatic email notification will be sent when the item is back in stock. This increases customer satisfaction and prevents lost sales opportunities. Notifications are customizable.

Reviews

Many users have experienced the effectiveness of the back-in-stock notification feature in recovering lost orders. The intuitive and easy-to-use setup completely automates tasks that were previously performed manually, significantly improving business efficiency.

The following are comments from some users

Thanks to the back-in-stock notification feature, orders from customers who had previously given up on orders are now being returned. The setup is also intuitive and easy-to-use.

Previously, we had to contact customers manually, but this app has completely automated the process, dramatically improving business efficiency.

The pricing plans seem a little high, but the features are well worth it. The notification templates are also professionally designed.

3rd Place

Bony Checkout Rules

App URL: Shopify View in the App Store

App Overview

This app lets you set detailed rules for shipping, payments, and products. It also provides flexible control over conditional branching during checkout.

App Details

You can apply detailed business rules to your checkout, such as restricting shipping methods to specific regions or displaying specific payment methods only to customers purchasing specific products. This helps prevent fraud and improves business efficiency.

Reviews

The app’s greatest appeal is its ability to flexibly set even the most complex shipping and payment rules. While the settings screen is technical, it’s a powerful tool once you get used to it. Users say it contributes to increased efficiency by eliminating the need for manual confirmation.

The following are some user comments:

I was able to set up extremely complex shipping rules with this app. It offers flexibility that other apps lack.

The rule settings screen is a bit technical, but once you get used to it, it’s a powerful tool. Thanks to it, manual checkout confirmations are no longer necessary.

This app is essential for stores that require detailed condition settings. However, I felt that thorough testing immediately after implementation was necessary.

4th place

RuffRuff Pre-Orders

App URL: Shopify View in App Store

App Overview

This app allows you to preorder out-of-stock or pre-release products. Gain insight into demand and improve your cash flow.

App Details

Easily add pre-order functionality to your product pages. You can continue sales even when inventory levels reach zero, preventing missed opportunities. It includes all the necessary pre-order features, such as displaying pre-order badges and setting partial prepayments.

Reviews

It’s highly rated for its ease of launching pre-orders and its usefulness in forecasting demand for new products. Many users comment that its simple operation and management enable smooth operations.

The following are some user comments:

Pre-orders are now easy to launch, helping to forecast demand for new products. The interface is simple and easy to use.

The ability to manage pre-orders at a glance is extremely convenient. Customer inquiries have decreased, and operations are running smoothly.

5th Place

Paid API

App URL: Shopify View in App Store

App Overview

This app provides API functionality to facilitate integration with external services and custom development. It supports flexible integration with payment systems.

App Details

Designed for securely and flexibly integrating external custom payment gateways or specific business logic into Shopify’s checkout process. It’s a developer-focused tool, allowing for advanced customization.

Reviews

Rated as an essential tool for large stores and developers requiring advanced customization. Specific testimonials point to its smooth integration with external systems and its usefulness in building unique payment flows.

The following are some user comments:

This is an essential tool for large stores requiring advanced customization. It now smoothly integrates with external systems.

The API documentation is easy to understand, which is extremely helpful for me as a developer. It was helpful when building my own payment flow.

While it may not be necessary for general store operations, I think it’s the best option for meeting special requirements.