What NMI Does

NMI is the gateway that handles card transactions on your site. Your High Wire Payments merchant account connects to this gateway. Your website uses NMI API keys to submit each transaction securely.

Your Activation Email

Once your merchant account is approved, you receive an NMI activation email. Use the link provided to set your password and sign in. This gives you access to your NMI dashboard.

API Keys

You can find your API Username and Password under Settings → Security → API Keys. These values allow your checkout system to send transactions through NMI.

Security Key

NMI provides a Security Key used for certain plugins and older integrations. You can generate this inside the Security Key section of the dashboard.

Connector Settings

This section controls AVS, CVV, and risk tools. Leave most defaults as-is unless your onboarding rep instructs you to adjust certain filters.

Connecting Your Website

• WooCommerce: Install the NMI plugin. Enter your API Username, Password, and Security Key.
• BigCommerce: Add NMI under Online Payments. Enter your gateway credentials.
• Shopify: Use your custom gateway instructions provided during onboarding.
• Custom integrations: Use NMI’s Direct Post or API documentation.

Fraud Tools

NMI includes tools like AVS, CVV checks, and risk filters. You can enable velocity checks and mismatched address filters to reduce declines and chargebacks.

Testing and Live Mode

Use Test Mode before going live. Run a test checkout and check your NMI dashboard to confirm the transaction appears. Disable Test Mode once everything is connected properly.

FAQ