Help understanding api

Hello, I am attempting to self manage oauth, I want to post a code state from client side to server side. The server action for this working great when I enter the code manually to test but I don’t understand how pass the code dynamically.

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Do I need to use an api action and use query parameter of “code”?

It says load here, will this run the post?

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And invoke the load run/ like this from javascript is okay?

function handleOpenURL(url) {
    setTimeout(function () {
        var queryString = url
        var urlSet = new URL(queryString);
        var urlState = urlSet.searchParams.get("state");
        var urlCode = urlSet.searchParams.get("code");
        if (urlState == 'xxxxx') {
            dmx.parse("apiCodeExchange.load({code:'" + urlCode + "'})");
        }
    }, 0)
}