Compare Flatpay vs. Opayo

Square POS is a simple, intuitive point-of sale (POS) solution. It provides a rich set of tools for inventory tracking, sales tracking, online payment processing and digital receipts. Square POS is available for Android and iOS devices. It records transactions offline by storing data locally, then automatically syncing information when there is an Internet connection. Square POS allows users to manage details such as names, prices and quantities. It also offers features such as a barcode scanner and discounts, credit card processing and gift cards, refunds and more.

Accept all payments quickly, securely, and easily. Accept card payments quickly and easily, no matter where you are selling. You can streamline the process of creating, sending, and tracking your invoices. Customer not available in person? Remote credit card payments can be made over the phone or via your computer. Get paid quickly Square makes it easy to create and grow an online store and accept online payments seamlessly with Square. Accepting cards is as easy, painless, secure, and fast as possible with Square. We don't charge extra, have no long-term contracts and are not able to use tricks. You can rely on fast, secure payments.

NMI Payments gives developers, SaaS builders, ISVs and ISOs a simple path to embedded payments. As a full-stack processor, acquirer, and technology partner, NMI enables you to integrate, brand, and manage payment acceptance within your platform—without becoming a PayFac or building complex infrastructure. The platform combines flexibility, scalability, and speed, offering white-labeled payments infrastructure that keeps your brand front and center. With omnichannel support for in-store, online, in-app, and unattended payments, you can deliver a consistent merchant experience across every touchpoint. NMI also manages onboarding, compliance, and risk, freeing your team to focus on innovation and customer growth. Developer-First Experience NMI’s developer-first environment puts full control in your hands. Build, test, and launch payments in a modern sandbox with clear documentation and ready-to-use code snippets. Guided onboarding flows and API recipes simplify integration, while low-code and no-code tools accelerate deployment. Business users can evaluate monetization options with instant revenue calculators and self-service sign-up. Whether you’re embedding payments for the first time or scaling across channels, NMI helps you go live faster, stay compliant, and grow with confidence

EBizCharge is the leading embedded payments application for businesses to accept payments directly inside QuickBooks, Microsoft Dynamics, NetSuite, SAP, Acumatica, and 100+ other business systems. Trusted by 20,000 companies, EBizCharge combines modern billing tools with integrated payment processing to help B2B companies get invoices paid faster, eliminate manual work, and keep payment data automatically synced to their ERP. Companies use EBizCharge to: ◉ Accept credit card, debit card, and ACH payments natively inside ERP, CRM, or eCommerce platforms ◉ Speed up collections with easy billing tools: payment links, online customer portal, recurring billing, saved cards, and more ◉ Improve security and reduce risk with PCI-compliance, encryption, tokenization, fraud protection, and certified by the PCI-Security Council ⎯ HOW IT WORKS IN YOUR ERP, CRM, & E-COMMERCE PLATFORMS EBizCharge integrates natively with your ERP, CRM, or e-commerce platform through certified software connections, so payments work directly inside the system you already use. ⎯ FEATURES • Email payment links • Recurring billing • Secure online customer payment portal • Securely save cards • EMV terminals • Mobile payments • Ability to surcharge • Dedicated in-house support

RetailEdge is a simple-to-use and feature-rich point to sale (POS) and inventory software solution for retail businesses. RetailEdge is a product of High Meadow Business Solutions. It offers multi-location support, credit card processing, website integration and mobile POS. Gift card management capabilities are also included in the suite. The solution supports mobile and secure payments such as Apple Pay and EMV. It also integrates with multiple ecommerce platforms for efficient order processing, price updates, and gift card management capabilities. How are we different? 1. One time-fee for the software. 2. Hybrid software, with all local data, to ensure you have fast real-time access to all your data when the internet is down or, more often, slow. 2. Comes with an hour of free training with real people. This includes making sure your inventory is structured properly and familiarizing you with the many powerful tools that will help you grow your business. 3. Optional on-going support and updates, designed to affordably fit your business needs, not the other way around. Integrated credit card processing with the most modern features and developed to get you the lowest rates so that you save money.

Melio is an accounts payable platform designed to simplify bill payments, improve workflows, and maximize cash flow efficiency for businesses of all sizes. To get started, try all of Melio's features free for 30 days! You can pay vendors online using bank transfers or credit/debit cards—even if they only accept checks—while Melio takes care of the manual tasks. Integrate seamlessly with QuickBooks and Xero to keep your accounting up-to-date. Melio allows you to pay through bank transfer or card, helping you extend your cash flow and gain rewards. Enter vendor or bill details manually, upload, or snap a photo of the invoice—it’s that simple. Schedule payments according to your cash flow plan and let Melio manage them. Additionally, you can pay international vendors in their local currency for services and products. On-the-go? No problem, just get the Melio mobile app on iOS or Android to manage your payments, process approvals, and much more no matter where your business day takes you.

Vibe Retail is a cloud-based point-of-sale (POS) and retail operations system designed exclusively for businesses that sell physical products through one or multiple locations. Unlike most POS platforms that attempt to serve restaurants, hospitality, or service-based businesses, Vibe Retail focuses only on retail, allowing the platform to be engineered around real retail workflows rather than generalized use cases. The system centralizes inventory, sales, employee, customer, and supplier data into a single, mobile-friendly interface. Retailers can track inventory across stores and warehouses in real time, manage product variations such as size, color, and material, and maintain serialized inventory for traceability. Additional capabilities include barcode generation and scanning, purchase order creation, supplier receiving, delivery reconciliation, and real-time stock transfers between locations. On the transaction side, Vibe Retail supports multiple retail payment types, including credit and debit cards, cash, checks, gift cards, and EBT. Retail-specific workflows such as layaway, delivery fulfillment, loyalty programs, and branded receipts are built into the system. Mobile receipt printing and role-based staff permissions allow retailers to operate efficiently both at fixed checkout counters and on the sales floor. Vibe Retail integrates with ecommerce platforms such as Shopify and WooCommerce, synchronizing inventory, orders, and customer data across online and physical channels. Built-in analytics provide more than 40 real-time reports covering sales performance, inventory movement, employee activity, and operational metrics, helping retailers maintain visibility and control as they scale.

Convesio gives commerce businesses the edge they need to grow faster — combining ultra-reliable WordPress hosting with seamless, built-in payment processing. At the heart of it all is ConvesioPay, a powerful payments platform that integrates directly with your hosting stack. No clunky plugins. No middlemen. Just faster, more secure transactions that help you convert and scale without friction. With auto-scaling containers, PCI-compliant infrastructure, and real-time revenue insights, Convesio removes the bottlenecks that slow down online stores. It’s performance, payments, and peace of mind — all in one place. Highlights: Integrated payments through ConvesioPay Built for WooCommerce and high-traffic stores Enterprise-grade uptime and scalability Security-first, PCI-compliant environment Real-time performance and revenue visibility

PayKings is a payment processing provider specializing in merchant account solutions for high-risk industries that often face challenges obtaining traditional payment services. The company offers a streamlined approval process powered by automated underwriting, allowing many businesses to gain access to payment processing capabilities within a short timeframe. Businesses can leverage merchant accounts, payment gateways, ACH processing, credit card processing, recurring billing, and virtual terminal solutions through a single provider. PayKings serves a broad range of industries, including adult entertainment, CBD, online gaming, firearms, debt settlement, travel, nutraceuticals, cryptocurrency, and other specialized markets. Fraud prevention tools and chargeback management services help businesses reduce risk while maintaining smooth transaction processing. The platform supports integration with leading gateways, eCommerce platforms, content management systems, and custom APIs. Dedicated account managers provide guidance throughout onboarding and ongoing operations, ensuring merchants receive industry-specific support. Transparent interchange-plus pricing models help businesses understand processing costs without hidden fees or long-term contractual commitments. PayKings enables high-risk businesses to access reliable payment infrastructure while supporting growth and operational stability.

Gr4vy's no-code payment orchestration platform empowers enterprises with full control to automate, customize and optimize their payment strategy effortlessly. Through a single integration, businesses can access over 400 payment methods, anti-fraud tools and payment service providers enabling them to optimize their stack in just a few clicks, all in a centralized platform. Built on dedicated cloud instances, Gr4vy infrastructure is the only one that eliminates the risk of a single point of failure, ensuring redundancy and high performance. At Gr4vy, our mission is to empower enterprises with full control to build, customize, and scale their payment strategy. We turn payment complexity into simplicity, allowing businesses to experiment, optimize, and unlock new revenue streams effortlessly. That way, merchants can focus on what matters—growth.