QuantumGateway is payment service that allows US-based businesses to process credit card transactions. The QuantumGateway add-on for Shopp provides a seamless onsite checkout experience where the customer stays on your website throughout the checkout process.

Getting Started

Before you can use the QuantumGateway add-on for Shopp, you will need a Quantum Gateway account. Sign-up for a QuantumGateway account before setting up the QuantumGateway addon in Shopp.

Restrict Key

When your account is setup and you have access to the account manager, you will need to setup your QuantumGateway Restrict Key, an additional account security mechanism. To set up the Restrict Key:

  • Login to your account at https://secure.quantumgateway.com
  • Navigate to Processing settings
  • Scroll to the RestrictKey section
  • Toggle the check box labelled Check to use RestrictKey
  • Click the Generate RestrictKey button
  • Click the Update button

Web Hosting Setup

Since the QuantumGateway payment system for Shopp uses an onsite checkout process, sensitive information (such as credit card numbers) may be entered on your website. In order to protect your customer’s information your website’s hosting service will need SSL Setup & Certificates.


  • Uncompress the add-on files
  • Upload the folder (directory) and all its contents to your Shopp add-ons folder (directory) under: .../wp-content/shopp-addons


When your Quantum Gateway account is approved and successfully set up, you will need to locate the Quantum Gateway Login and the Restrict Key.

To setup Shopp to use Quantum Gateway, login to your website’s WordPress Admin and navigate to ShoppSetupPayments.

  • Payment Gateway
    Select QuantumGateway from the Payment Gateway menu and click the Add Payment Option button.
  • Option Name
    Enter a custom label for the payment option as you would like it to appear on your store front (such as Credit Card).
  • Supported Cards
    Select the payment cards your site will accept for processing.
  • Login
    Enter your Quantum Gateway account Login name.
  • Restrict Key
    Enter the Restrict Key from the Processing settings in your QuantumGateway account manager.

Be sure to save your changes.

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