Error: Cannot convert "POST" to int

The following function returns an error when using the https://www.fmz.cn/bbs-topic/4183#io function to access the plug-in closure:

var id = exchange.IOThe following is a list of the most common types of order types: or var id =exchange.IO("api", “POST”, “/api/v1/order”, “”, JSON.stringify({symbol:“XBTUSD”,side:“Buy”,orderQty:1,stopPx:4000,ordType:“Stop”}))

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