Money in GofF - a Wizard ATM?

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No: HPFGUIDX 35013

I'm rereading GofF and wondered how much wizard gold Harry had left 
from the year before. 

When he was picked up by the Weasley's for the world cup, Mrs. 
Weasley's said she pick up all his school supplies at Diagon Alley. 
Harry meanwhile bought 3 omnioculars (30 Galleons) plus assorted 
other souveniers. 

There is no mention of Harry visiting Gringotts. Did he arrange for 
the goblins to conjure him money? Or did he write a 'wizard check' to 
Mrs. Weasley? Better yet, does Harry have a line of credit? There is 
no mention of wizard credit cards.

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