Best Payment Processing Software - Page 44

How Many Payment Processing Software Products Does G2 Track?

Total Products under this Category: 754

Category Stats (Sep 2026)

  • Average Rating: 4.36/5 (↑0.01 vs Aug 2026) The average rating of products in this category, based on all submitted ratings
  • Top Trending Product: Stitch (+5.56%) - Among all products in this category, Stitch recorded the largest rating increase compared to last month

Last updated: September 01, 2026

How Does G2 Rank Payment Processing Software Products?

Why You Can Trust G2's Software Rankings:

  • 30 Analysts and Data Experts
  • 22,300+ Authentic Reviews
  • 754+ Products
  • Unbiased Rankings

G2's software rankings are built on verified user reviews, rigorous moderation, and a consistent research methodology maintained by a team of analysts and data experts. Each product is measured using the same transparent criteria, with no paid placement or vendor influence. While reviews reflect real user experiences, which can be subjective, they offer valuable insight into how software performs in the hands of professionals. Together, these inputs power the G2 Score, a standardized way to compare tools within every category.

G2 Grid® for Payment Processing Software

G2 Grid® for Payment Processing Software plotting products by satisfaction and market presence

Highlighted products: PayPal Payments, Amazon Pay for Business, Venmo, BILL AP/AR, Adyen Payments, PayPal Checkout, Stripe Payments, and Nickel.

Underlying data: [Grid® JSON](https://www.g2.com/categories/payment-processing/grids.json?focus%5B%5D=paypal&focus%5B%5D=amazon-pay-for-business&focus%5B%5D=paypal-venmo&focus%5B%5D=bill-ap-ar&focus%5B%5D=adyen-payments&focus%5B%5D=paypal-checkout&focus%5B%5D=stripe-stripe-payments&focus%5B%5D=nickel)

SlimPay

At SlimPay, we are on a mission to help every merchant enroll customers and collect repeat payments to grow their business. SlimPay partners with medium and large merchants to deliver a frictionless payment experience across channels. Our payment solution helps merchants streamline acquisition, increase customer lifetime value and maximize revenue—through card, direct debit and open banking services. Launched in 2010, SlimPay has offices in Paris and Madrid, with 100 employees from 20+ nationalities. SlimPay serves customers across several industries, such as Deezer, SFR, EDF, Nespresso and Vattenfall. For more information, visit www.slimpay.com and follow us on Twitter or LinkedIn @SlimPay.

Who Is the Company Behind SlimPay?

  • Seller: SlimPay
  • Year Founded: 2010
  • HQ Location: Paris, FR
  • LinkedIn® Page: www.linkedin.com
    81 employees on LinkedIn®

SMART Hub

SMART Hub is a first-of-its-kind payment portal that digitizes and simplifies the way that businesses make, receive, and manage payments, and access payment insights. The portal provides a pre-built integration with any ERP, accounting software or system of record and includes a built-in onboarding module that guides businesses through the process of setting up the application. Integrating SMART Hub with an ERP, accounting software package or system of record streamlines the process of making and receiving payments, eliminates complexity through the automatic reconciliation of payments, and puts real-time payments insights and historical transaction details at a user’s fingertips.

Who Is the Company Behind SMART Hub?

  • Seller: Transcard
  • Year Founded: 2008
  • HQ Location: Chattanooga, Tennessee, United States
  • LinkedIn® Page: www.linkedin.com
    190 employees on LinkedIn®

SOLAR Acquiring

SOLAR Acquiring is a payment acceptance solution designed for banks and payment providers to process transactions across multiple channels out of the box. Whether you’re enabling in-store, online, or mobile payments, SOLAR Acquiring provides everything you need to manage the full acquiring lifecycle: secure transaction processing, seamless integration with POS and e-commerce platforms, real-time monitoring, and compliance with global payment standards.

Who Is the Company Behind SOLAR Acquiring?

  • Seller: Solanteq
  • Year Founded: 2015
  • HQ Location: Saint-Gilles, BE
  • LinkedIn® Page: www.linkedin.com
    46 employees on LinkedIn®

SOLAR Switch

The solution designed for banks and payment providers to connect, route, and manage transactions across multiple payment networks and processing systems. Whether you're expanding your payment infrastructure or modernizing existing processing capabilities, SOLAR Switch provides everything you need to ensure seamless transaction routing: intelligent message switching, protocol translation, third-party integrations, real-time processing, and reliable connectivity across the payment ecosystem.

Who Is the Company Behind SOLAR Switch?

  • Seller: Solanteq
  • Year Founded: 2015
  • HQ Location: Saint-Gilles, BE
  • LinkedIn® Page: www.linkedin.com
    46 employees on LinkedIn®

Sonder

Sonder Payments is a membership-based payment processor. Rather than paying a percentage markup on every transaction, Sonder Payments members pay a flat membership fee. In addition to transparent pricing, Sonder Payments offers dedicated support representatives, lightning-fast deposits, a slew of hardware options, an online virtual terminal, hundreds of integrations, and more.

Who Is the Company Behind Sonder?

SPAYZ.io

SPAYZ.io is your gateway to seamless payments across Asia, Africa, and Europe. With over a decade of experience, we connect businesses to the future of finance - from Open Banking, Bank transfers and Mass Payouts to Wallets, Online Banking, QR Code Payments, Mobile Payments and Bank Cards. We support high-growth merchants with complex operational needs across 30+ countries with 50+ payment methods.

Who Is the Company Behind SPAYZ.io?

SquareFi

SquareFi is a global financial platform for modern businesses — bringing together payments, multi-currency accounts, corporate cards, and crypto tools in one place. We help companies simplify international finance: send and receive payments, manage fiat and digital assets, launch card programs, and scale globally — all through a single, flexible infrastructure. 💡 What you can do with SquareFi: • Open multi-currency IBAN accounts in 27+ currencies • Convert fiat to crypto and back with seamless On/Off-Ramp • Issue virtual and physical corporate cards — or launch a branded program • Access payments and card infrastructure via API or dashboard Whether you’re building a fintech product, managing global payouts, or looking to automate financial operations — SquareFi gives you the toolkit to grow without limits. Let’s simplify finance together.

Who Is the Company Behind SquareFi?

  • Seller: SquareFi
  • Year Founded: 2022
  • HQ Location: Sheridan, US
  • LinkedIn® Page: www.linkedin.com
    12 employees on LinkedIn®

Square Payment Links

Who Is the Company Behind Square Payment Links?

  • Seller: Afterpay
  • Year Founded: 2010
  • HQ Location: Melbourne, VIC
  • Twitter: @AfterpayUSA
    29,699 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    560 employees on LinkedIn®
  • Ownership: ASX: APT

Square Virtual Terminal

Who Is the Company Behind Square Virtual Terminal?

  • Seller: Afterpay
  • Year Founded: 2010
  • HQ Location: Melbourne, VIC
  • Twitter: @AfterpayUSA
    29,699 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    560 employees on LinkedIn®
  • Ownership: ASX: APT

Stella Source

Stella Source is the revenue engine for metals -- one platform for pricing, quoting, ordering, and payments -- built for the way metal is actually bought and sold. Most metal service centers and fabrication shops are leaving revenue on the table because their sales process is the bottleneck standing between them and revenue growth. Stella Source fixes that. Invite your customers to your online storefront where they can browse your catalog, see their specific pricing, and place stock or fabrication orders on their own time, without waiting on your team. Give your sales team the easiest path to an accurate quote no matter the sales channel, email, phone, fax, or online. Without ever leaving the inbox, your sales team can use AI-powered tools that turn any order request into a ready-to-send quote in minutes. And when the order closes, send digital payment links to convert to cash faster than ever. The result is a business that grows revenue from existing customers, reaches new digital-native buyers, and scales sales capacity. Your team spends less time managing the process and more time on the relationships that actually move the needle.

Who Is the Company Behind Stella Source?

SumUp Plus Card Reader

Who Is the Company Behind SumUp Plus Card Reader?

  • Seller: SumUp.com
  • Year Founded: 2012
  • HQ Location: London, England, United Kingdom
  • Twitter: @SumUp
    12,265 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    4,414 employees on LinkedIn®
Subhransu Sahu
SS
Researched and written by Subhransu Sahu
Updated April 9, 2026