Payments processor reports highest spending levels since last summer.
Processor says data shows two-year jump of 12% in average debit transaction.
Trend reversal occurred in 2012, according to the Nilson Report.
Card issuing credit unions are probably looking at a better than average month for credit and debit card interchange.
Caution noted: Consumers reducing discretionary spending while increasingly resorting to credit for necessities.
First Data says the pace of consumer payments slowed significantly in April over the pace during the first quarter of the year.