It seems that in todays climate you never know who has the money to pay their bills. I think that the smaller companies are just going to have to demand payment up front for the services they provide. Great if you have a credit card facility but not all small landing sites, that also provide very welcome refuels, do and the company does not give us cash to pay.
With "climate change" everyone needs to do their bit, or even just for your own convenience it is best to drop into an airfield en route as oppossed to take a detour. It is also cost effective! But then what would accountants know about that.