This message means marketPriceType in your webhook JSON is present but not a supported value. It must be one of: ask_bid, mark, ask, bid, or last. Omit the field if you want TradersPost to use Entry market price type or Exit market price type from the subscription (depending on the order).
Valid example:
{
"ticker": "AAPL",
"action": "buy",
"orderType": "limit",
"marketPriceType": "bid"
}
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