7 Field format error: 10444-The transaction currency specified must be the same...

[Buffoon]

Thanks, that's what I thought as well! I can't understand why Paypal is showing a GBP payment screen when ZC seems to be correctly configured. I'll open a ticket with Paypal and report back if they are able to clear up the mystery from their end :/

[Buffoon]

Paypal finally got back to me and said that their logs were showing the request was showing in GBP at their end. It seems to be limited to the UK Payflow service since when I switched back to traditional Paypal, the problem went away. I guess I'll avoid Payflow for now!