Custom Payment Methods in SuitePOS for NetSuite – Setup and Configuration Guide | SuiteRetail Support

Custom Payment Method

A custom payment method can be created to allow payments and refunds to be posted to.
Warning
Not Available for the Salesforce Integration
Idea
Useful for retailers that accept 3rd party vouchers, allow various return scenarios or need to accommodate non-integrated credit card payments (due to outage or using a 3rd party processor). 
Add the custom payment method to POS Settings:











In the POS (Sale or Return):

Warning
This payment method is NOT counted towards drawer totals (like a credit card)
Warning
The custom payment method is available on ALL returns - even if matched refunds = true
Info
The custom payment method can be used for splits