cURL API integration with dynamic data and header authentication - php

Question

I am working on auto sync between two systems. We have the database in one system and we are using another system for marketing. I am able to pull complete data from the database system. But when I am inserting the data to the marketing tool, it says invalid body request.
in the documentation, these are the details:
1)-url-:
https://api.customdomain/recipients
2)-request body:
[
{
"email": "jones#example.com",
"last_name": "Jones",
}
]
3)-auth-headers:
authorization is done through the header.
Authorization: Bearer *API key goes here*;
This is the code I tried. I should able to place data dynamically.
$fields = array(
'email' => "jam22#example.com",
'last_name' => "test40"
);
$methd="POST";
$url="https://api.customdomain/recipients";
$data=http_build_query($fields);
$rep= CallAPI($methd, $url, $fields);
echo $rep;
function CallAPI($method, $url, $data = false)
{
$curl = curl_init();
switch ($method)
{
case "POST":
curl_setopt($curl, CURLOPT_POST, 1);
if ($data)
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
break;
case "PUT":
curl_setopt($curl, CURLOPT_PUT, 1);
break;
default:
if ($data)
$url = sprintf("%s?%s", $url, http_build_query($data));
}
$headr=array(
"authorization: Bearer *API key here*",
"cache-control: no-cache"
);
$ver="CURL_HTTP_VERSION_1_1";
// Optional Authentication:
//curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
// curl_setopt($curl, CURLOPT_USERPWD, "username:password");
curl_setopt($curl, CURLOPT_HTTPHEADER,$headr);
curl_setopt($curl, CURLOPT_HTTP_VERSION,$ver);
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($curl);
curl_close($curl);
return $result;
}

Answer 1

I got it. The format of the body which Marketing tool receives is different from this array method. I modified the array to a string. Now it is working perfectly.
This is enough from CURL
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, "https://api.custom");
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);//Setting post data as xml
curl_setopt($curl, CURLOPT_HTTPHEADER, array("authorization: API key"));
$result = curl_exec($curl);
curl_close($curl);
print($result);