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What to do with terminal descriptors?
They seemed out of place, therefore been removed for the moment. We need to encompass too much in a single abstraction, looks like we need dynamic schemas for this kind of thing.
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Way to specify terminal attributes (more generally, attributes of technical interaction) for a specific merchant.
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Some proxies need to know provider profit / compensation.
Expose cash flow?
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In order to acquire foreign customers we need to store a billing address.
Maybe a good fit for a payment session?