In order to integrate Payline Gateway with Volusion, please follow these steps.

Set Gateway option as “Network Merchants”, gateway name is MERCHANTPARTNERS

Custom Field 1 is Account

There are no other fields to include for Custom 2 or 3.

This is all outlined at the url below.

If you have further questions, I encourage you to contact Volusion Support. If you need assistance with the gateway, then gateway support is your best option at 847-352-4850.