Authorize.Net CIM: How to add Level 2 data

As Magento does not support many of the level 2 data fields out of box, we do not enable any of the additional fields by default. To add in the additional Level 2 data you desire, create a before plugin on the function \ParadoxLabs\Authnetcim\Model\Gateway::createTransaction and set the parameter information you desire such as:

$gateway->setParameter('purchaseOrderNumber', ...)

Additional Level 2 fields can be set similarly, and you can see what parameters those should be in \ParadoxLabs\Authnetcim\Model\Gateway::createTransactionAddAmounts.