How to configure Offline payment plugin
Offline payment plugin is a special plugin, it is developed to collect your guest's credit card information without verifying or processing them (if you need to verify or processing a card, you should use payment plugins like PayPal, Stripe or Authorize.net).
Configuring this plugin is very easy. First, you need to download and install this plugin (available to all subscribers). Then activate it in WordPress Plugin Manager and you will see a new Offline section while editing your asset - tab Payments, you need to enable Offline for your asset, done. There are some more fields to configure like choosing your accepted card brand.
Now when you make a new reservation in the front end, you will see new Offline payment method in reservation step 2.
So it will collect the guest's credit card, what will it do with them?
After the reservation is completed, the guest's credit card number will be split into 2 parts, the first part will be stored into Solidres database so that you can see it in your reservation edit screen and the second part will be emailed to the asset's email. This is for security reason.
Now you have your guest credit card info, you can use it for manual processing/verification.