Hover over the Payment Method value and click the Gear icon that appears to open the Field mapping screen. Enter the Magento 2 values in the Export Field and select the NetSuite values from the Import Field and Save. These configurations are available now in the Magento 2 Payment Methods section.
Setting a default value for Payment Method mappings
The mappings section enables you to set up default values for ship methods. Edit the mappings for the Order management flow.
Select the Payment method field map settings and go to the Static value to value lookup mapping.
Static value to value lookup mapping section: Deselect ‘Fail if unique match not found and select a ‘Default lookup value’ and Save. This default value is mapped for the payment method.