Each payment option should be able to have its own Sage Pay merchant ID and merchant key. When setting up a new payment option, it may pre-fill in the default ID and key but there is no reason that you can't change it within that payment option.
Sage Pay integration
13 years 11 months ago #13100
Jane Blonde
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I've just confirmed with Sage Pay that it's not possible to use sub accounts, a separate account is required. We do not need to do this work after all...yea!