Payment Gateways and Integrated Payments
Connect your software, website, or POS to secure payment processing with flexible gateway solutions from Mercantile Processing Inc.


Secure connections • Flexible integrations • Supported by MPI
Payments That Work Behind the Scenes
Wide Compatibility
Support for a broad range of shopping carts, software platforms, and POS systems.
Secure Transactions
Gateway solutions built to protect payment data and reduce risk.
Our team helps ensure your gateway is properly configured and connected.
Guided Setup
Flexible Gateway Solutions for Modern Payments
MPI provides payment gateway and integrated payment solutions that allow businesses to accept payments online, through software platforms, or directly within their POS system. Whether you’re running an eCommerce site, invoicing customers, or connecting specialized software, we help ensure payments flow smoothly and securely.
Online & eCommerce payment acceptance
Software and POS integrations
Virtual terminal access
Invoicing and payment links
Secure transaction processing

Payment Gateway FAQs
What is a payment gateway?
A payment gateway connects your website, software, or POS system to payment processing so transactions can be securely authorized and completed.
Are payment gateways secure?
Yes. Gateways follow industry standards designed to protect payment data.
Do gateways work with existing websites or software?
Yes. Many gateway solutions support common platforms and integrations. MPI helps confirm compatibility before setup.
Can gateways integrate with POS systems?
Yes. Many POS systems use gateways to process payments directly within the platform.
Can I accept online payments without a full eCommerce site?
Yes. Options such as virtual terminals and payment links allow you to accept payments without a traditional online store.
Connect Your Payments with Confidence
Whether you need online payments, software integration, or gateway support, MPI helps you choose a solution that fits your systems and your goals.
