PayDvpFee.
Invoked through the two-phase transaction flow with:
operation = TRANSACTION_OPERATION_PROPOSE_DVPparams.propose_dvp = ProposeDvpParams { … }
Params
Settlement proposal identifier — must match the one used in
PayDvpFee.Next step
The counterparty discovers the resultingDvpProposal via GetSettlementContracts and accepts it with AcceptDvp.
Full sequence: PayDvpFee → ProposeDvp → AcceptDvp → PayAllocFee → Allocate.