使用R访问AJAX API

Question

I'd like to access data from an jQuery/AJAX api within R. Is there a way to call jQueries in R?

These are some examples of AJAX requests, would be great if I could translate them into R code and get the response back into a data frame.

$.ajax("https://nestiolistings.com/api/v2/agents/?key=<your_key>")

Or a more complex one,

$.ajax({
    url: "https://nestiolistings.com/api/v2/listings/350889/contact/?key=<your_api_key>",
    type: 'POST',
    data: {
        name: 'John Doe',
        email: '[e-mail]',
        phone: '[phone]',
        message: 'Lorem ipsum dolor sit amet, cu has labores adipiscing id.'
    },
    contentType: 'application/json'
})

Link to their API docs: http://developers.nestio.com/api/v2/listings.html#listing-contact

I also found this but it'd be great if I can get an example on how would this calls work on this specific API, and maybe there are other suggestions for jQuery packages within R. https://cran.r-project.org/web/packages/RSelenium/vignettes/RSelenium-basics.html