Invoice API PHP example

Hello,

I'm trying to integrate with zoho, but I have some issue with API,

Please provide same php example of using api, e.g how to get list contact
I tried to use :

function listCustomers() {

$authtoken = '2f89455f7767e00d28ea38ee0baa7837';

$Organisation = '37517635';

$ch = curl_init($url);

curl_setopt($ch, CURLOPT_VERBOSE, 1);

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);

curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

curl_setopt($ch, CURLOPT_POST, TRUE);

curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/x-www-form-urlencoded"));

curl_setopt($ch, CURLOPT_POSTFIELDS, "&JSONString=".urlencode(json_encode($jsonData)));

$result = curl_exec($ch);

var_dump($result);

curl_close($ch);

}

but I have a result:

string(49) "{"code":1038,"message":"JSON is not well formed"}"

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