Passing Total Actual Cost Back To OTM from SERVPROV

Summary: Passing total actual cost from our 3PL provider to OTM. What event/schema can be used to pass back their total actual cost?

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We are partnering with an 3PL LTL provider and are working on integration. We have a blanket rate with them in OTM and are tendering and auto accepting a shipment to them. When they book an LTL asset, they will pass us back carrier info as a refnum and Total Actual Cost. What schema can be passed to OTM that contains AND updates OTM "TOTAL ACTUAL COST". We are looking for this to be updated BEFORE invoicing takes place so that we can match in financials.