Table: efsnetRequestMod

	date int
	cashierNo int
	laneNo int
	transNo int
	transID int
	datetime datetime
	origRefNum varchar
	origAmount double
	origTransactionID varchar
	mode varchar
	altRoute tinyint
	seconds float
	commErr int
	httpCode int
	validResponse smallint
	xResponseCode varchar
	xResultCode varchar
	xResultMessage varchar

Depends on:
	efsnetRequest (table)

This table logs information that is
returned from a credit-card payment gateway 
when modifying an earlier transaction.
Generally, this means some kind of void.
All current paycard modules use this table
structure. Future ones don't necessarily have
to, but doing so may enable more code re-use.

Some column usage may vary depending on a
given gateway's requirements and/or formatting,
but in general:

cashierNo, laneNo, transNo, and transID are
equivalent to emp_no, register_no, trans_no, and
trans_id in dtransactions (respectively).

mode is the operation type. Exact syntax varies
by gateway. Some gateways provide multiple
addresses. Using a different one can be noted
in altRoute.

seconds, commErr, and httpCode are curl-related
entries noting how long the network request took
and errors that occurred, if any.

the x* columns vary a lot. What to store here 
depends what the gateway returns.