Thanks for @Brooke information.

Got it working with

Host="https://app-money.tmx.com/graphql"
Payload = {
        "operationName": "getQuoteBySymbol",
        "variables": 
        {
            "symbol": "BNS",
            "locale": "en"
        },
        "query": "query getQuoteBySymbol($symbol: String, $locale: String) {\n getQuoteBySymbol(symbol: $symbol, locale: $locale) {\n symbol\n name\n price\n priceChange\n percentChange\n }\n}"
    }

    response = requests.post(Host, json=Payload)