cURL POST method not working - php

Question

I am using cURL to call a REST API. And the below code works for GET method , but however for POST method call it doesn't work after i add :
curl_setopt($ch, CURLOPT_POST, true);
What could be the cause ?
$options = array(
CURLOPT_RETURNTRANSFER => true, // return web page
CURLOPT_HEADER => false, // don't return headers
CURLOPT_FOLLOWLOCATION => true, // follow redirects
CURLOPT_ENCODING => "", // handle all encodings
CURLOPT_USERAGENT => "spider", // who am i
CURLOPT_AUTOREFERER => true, // set referer on redirect
CURLOPT_CONNECTTIMEOUT => 120, // timeout on connect
CURLOPT_TIMEOUT => 120, // timeout on response
CURLOPT_MAXREDIRS => 10, // stop after 10 redirects
CURLOPT_SSL_VERIFYPEER => false, // Disabled SSL Cert checks
CURLOPT_HTTPHEADER => array('appId: C579929D-F0AA-4A8F-B6C6-1FF96694483C','appKey: AE78E7F1-FBDE-45F5-BAC2-210CEE9D3ED9')
);
$url = "some-url";
$ch = curl_init($url);
curl_setopt_array($ch, $options);
curl_setopt($ch, CURLOPT_POST, true);
$output = curl_exec($ch);
echo $output;
P.S
I double checked the API call using PostMan and it returns the expected result.
Do i need to add additional properties to API call ?
And i have to call REST API of format :
https://api.abc.com/v1/transactions/companyid/123/userid/456/description/ppeck/‌​source/PPA
And as suggested in the answer i have updated my code as :
$url = "https://api.abc.com/v1/transactions";
$ch = curl_init($url);
curl_setopt_array($ch, $options);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, "companyid=12301&userid=31401&description=ppa-check&source=PPA&amount=123&txndate=010111&txntypeid=420&customerid=2701");
$output = curl_exec($ch);
And sadly it didn't worked.

Answer 1

try
post fields must be as a query string with appending (&) like
$url = 'http://example.com'; //your api call url
$fields = 'q=example&y=fgt&ghty'; // all posting fields separated with &
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);