Convert Rest API call from PHP to RUBY

Im trying to convert a post connection to the walmart api, from php to ruby, this is the php version

$client_id = $data['client_id']; $client_secret = $data['client_secret']; $url = "https://marketplace.walmartapis.com/v3/token"; $uniqid = uniqid(); $authorization_key = base64_encode($client_id.":".$client_secret); $code = ""; $ch = curl_init(); $options = array( CURLOPT_URL => $url, CURLOPT_RETURNTRANSFER => true, CURLOPT_TIMEOUT => 60, CURLOPT_HEADER => false, CURLOPT_POST =>1, CURLOPT_POSTFIELDS => "grant_type=client_credentials", CURLOPT_HTTPHEADER => array( "WM_SVC.NAME: Walmart Marketplace", "WM_QOS.CORRELATION_ID: $uniqid", "Authorization: Basic $authorization_key", "Accept: application/json", "Content-Type: application/x-www-form-urlencoded", ), ); curl_setopt_array($ch,$options); $response = curl_exec($ch); $code = curl_getinfo($ch,CURLINFO_HTTP_CODE); curl_close($ch); 

and this is what i have so far:

url = "https://marketplace.walmartapis.com/v3/token/" uniqid = "1234567890a1b" uri = URI.parse(url) request = Net::HTTP::Post.new(uri) request["WM_SVC.NAME"] = "Walmart Marketplace" request["WM_QOS.CORRELATION_ID"] = uniqid request.basic_auth(client_id, client_secret) request["Accept"] = "application/json" request.content_type = "application/x-www-form-urlencoded" request["WM_SVC.VERSION"] = "1.0.0" req_options = { use_ssl: uri.scheme == "https", } response = Net::HTTP.start(uri.host, uri.port, :use_ssl => uri.scheme == 'https') do |http| http.request(request) end puts "error " + response.code puts response.body 

Now, im getting a 400 error, so something of the data im sending is incorrect or missing... comparing both, i dont have set the postfields option on ruby, for the POST request, not sure if the rest is required as well... any ideas?