Unintended truncation of State Code on eWay screen and receipt

Yes, inserting AU-NSW in the state field on a new registration works fine as far as eWay showing NSW in its screen and receipt.

That of course leaves me still with the large problem of users just entering NSW as is practice here. Are you assuming some post input process that adds AU- to the state field when a user enters NSW (and Australia in the country field)? And what is the advantage of this prefix - why not simply use the state code as given?

The prefix is supposed to be there. CBSubs adds it if you update the invoice address through CBSubs instead of just letting it sync from a CB field. I think this is a bug of the field sync feature though as it should properly format it, but it doesn't appear to be doing so. Have created a bug ticket for further investigation. In the mean time you can try applying the below to see if it'll work with either/or usages for now.

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Thanks Kyle. The patch worked well on a new registration test.

In terms of the possible bug, in case it is relevant we currently have Paid Subs | Settings | Display | Invoices | Customer invoicing address set to No Invoicing Address Shown, though earlier in our testing we did have this set to one of the Yes options.

It's due to the CB field to CBSubs invoice field synchronization. It's not properly formatting the values it's getting from your CB fields. It should be formatting and validating them correctly so this doesn't happen. I've created a bug ticket to investigate further for next release. For now just continue to use the workaround.