"With other relevant factors - including migration, jobs growth, house price gains, and consumer confidence - all continuing to be very favourable, we would not be at all surprised to see retail card spending regaining momentum in coming months."
Spending on durables recorded the biggest drop last month, down 1.2 per cent to $1.13 billion, while consumables fell 0.4 per cent to $1.67 billion.
Hospitality spending on debit and credit cards was flat, after eight consecutive monthly gains while spending on apparel edged up 0.1 per cent.
"A strong summer tourist season which boosted hospitality spending (particularly in February, possibly reinforced by the Cricket World Cup) has now come to an end," Delbruck said.
"Petrol prices have been rising, unwinding some of the boost to consumers' purchasing power that occurred over the summer when fuel prices plunged."
On an annual basis, all four core retail measures rose.
Hospitality spending jumped 11.2 per cent compared to the same month a year earlier.
Consumables rose 5.6 per cent, Durables rose 5.2 per cent and apparel gained 3.4 per cent.
In actual terms, card-holders made 119 million transactions across all industries in April, with an average value of $50. The total amount spent across all the transactions was $5.9 billion.
The total value of all electronic card spending, including services and other non-retail industries, fell 1.1 percent in April, following a 1.2 percent gain in March.