In order to integrate Checkfront with the NMI Payment Provider, you first need to create an NMI account if you haven't already done so. You can do that here: https://www.nmi.com
Setup in CheckfrontBack to top
To enable NMI, log in to your Checkfront account and navigate to Manage > Ecommerce Setup, making sure the Payment tab is selected.
Here you see a list of available payment modules. Locate the NMI tile from the list.
You find it by clicking on the links in the left side menu labelled Available to [your country] or All. You can also search for the NMI tile directly in the provided search box.
Hover over the tile, which turns grey, and click.
This opens the NMI activation window, as pictured above. From here, enter your NMI Gateway Username as the Login ID and NMI Gateway Password as the Key in the fields provided and then click the blue Activate button.
NMI is now successfully integrated with your Checkfront account and is listed under your section of Active Providers.
Also, make sure you have enabled payment processing and configured any applicable taxes and ecommerce settings in the Manage > Ecommerce Setup section of Checkfront.