And if you're really worried, get your tech pilot to submit a tech request to Airbus.
Airbus do permit refuelling with one engine running, but most regulators and companies don't. The trouble with threads like this is that people reply with their company limitations, not realising that they are just that - company limits. They might be brought about by fleet commonality with Boeings, or old wives tales, archaic regulators or crusty chief pilots still living in the DC10 days. Other companies with different circumstances, training, locations etc may elect to do it.