Transaction Facet

The interaction pattern and payload are confusing. The interaction diagram shows Party and a Counter Party with the Party initiating the EiCreateTransactionPayload().
This seems counterintuitive for a typical scenario, where a market actor would match two parties. For each of their contracts, one is the Party the other CounterParty. The market needs to notify each andÂconfirm the transaction. What is the expected payload of the market sent to the two parties? EiCreateTransactionPayload or EiCreatedTransactionPayload? In what scenario does a Market actor need to expose both? __ If the latter, who would call EiCreateTransaction?

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