freight/shipping costs need to be "preset" instead of "prepaid" (MarKov integration)

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Our shopify site communicates with MarKov inventory management system. Shopify is sending freight charges (aka shipping costs) to MarKov with some kind of a tag or suffix or notation that reads "prepaid." This needs to be "preset" instead of "prepaid" according to MarKov. Shopify Support has been no help. Any ideas? Thanks.