Webhook Trade via JSON

I have created alert from Tradingview chart to trade via JSON, But after getting alert execute both side trade, despite to get alert of one side

Please check my json and resolve the problem.
der",“order_legs”:

Sale
[{“transactionType”:“S”,“orderType”:“MKT”,“quantity”:“75”,“exchange”:“NSE”,“symbol”:“SAIL”,“instrument”:“EQ”,“productType”:“I”,“sort_order”:“1”,“price”:“0”}]}

Buy
{“secret”:“ScOpx”,“alertType”:“multi_leg_order”,“order_legs”:[{“transactionType”:“B”,“orderType”:“MKT”,“quantity”:“75”,“exchange”:“NSE”,“symbol”:“SAIL”,“instrument”:“EQ”,“productType”:“I”,“sort_order”:“1”,“price”:“0”}]}