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If you want the configure parameter tab to show up, copy the directory <commercemanager>\Shared\Apps\Order\Payments\Plugins\DIBS and name it <commercemanager>\Shared\Apps\Order\Payments\Plugins\DIBS2 if your using the DIBS2 as system keyword. This will hopefuly solve your first issue...
Is it possible to use two different dibs account using commerce? When I try to create a new Payment Method with the System Keyword DIBS I get the following error message Payment method with specified name already exists. And if I enter DIBS2 in the System Keyword field I don’t get the DIBS parameters in the Parameter tab.
Is there any easy solution to solve this?