<?php

    $url = "https://scarthefur.gumroad.com/l/kitabikini";

    $string = file_get_contents($url);

    $dom = new DomDocument();
    @$dom->loadHTML($string);
    $finder = new DomXPath($dom);

    $content = $finder->query("//*[contains(concat(' ', normalize-space(@data-component-name), ' '), ' ProductPage ')]")[0]->textContent;            
    $content = json_decode($content);

    print_r($content->product->seller);

?>