In order to integrate Checkfront with the NMI Payment Provider, you will 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
Once you have an NMI account configured you can proceed with the setup in Checkfront. Navigate to Manage > E-Commerce in your booking manager and click on the ...payment methods available to <your country> link.
From there, look for the NMI tile and click on the button labeled NMI to open the activation window.
Enter your NMI Login ID and Login Password in the fields provided, then click the blue Activate button.
The integration is now complete and you can go ahead with your payment processing.