WordPress - Issues with referencing custom PHP class in functions.php - php

Question

I apologize if this is really dumb/obvious but this is my first experience working with classes in WordPress.
I made a class called SharpSpringService.php inside my custom plugin sharpspring-form. I placed the class within a classes folder within that custom plugin for organization purposes.
I'm referencing the SharpSpringService class within a function in functions.php but am getting an error. When I declare a new instance of SharpSpringService and place the account ID and secret key as parameters, I get a message: "Expected SharpSpring, got string". I also see an Internal Server 500 Error in the Chrome dev consoles that seems to be a result of creating an instance of this class.
I'm not sure why the parameters are expected to be "SharpSpring" as they should be accountID and secretkey.
Here is the SharpSpringService class:
private $authError = false;
private $accountID = null;
private $secretKey = null;
/**
* SharpSpringService constructor.
* #param $accountID SharpSpring Account ID
* #param $secretKey SharpSpring Secret Key
*/
public function __construct($accountID, $secretKey)
{
$this->accountID = $accountID;
$this->secretKey = $secretKey;
}
public function hasAuthError() {
return $this->authError;
}
public function makeCall($method, $params = []) {
$requestID = session_id();
$accountID = $this->accountID;
$secretKey = $this->secretKey;
$data = array(
'method' => $method,
'params' => $params,
'id' => $requestID,
);
$queryString = http_build_query([
'accountID' => $accountID,
'secretKey' => $secretKey
]);
$url = "http://api.sharpspring.com/pubapi/v1/?$queryString";
$data = json_encode($data);
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
'Content-Type: application/json',
'Content-Length: ' . strlen($data)
));
$result = curl_exec($ch);
curl_close($ch);
$resultObj = json_decode($result);
if ($resultObj->error != null) {
throw new \Exception($result->error);
}
return $resultObj;
}
}
And here is the function in functions.php that is referencing the class:
function get_memberships_callback(){
$newsListID = 550280195;
$listName = "NewsList";
$contactEmail = $_POST['contactemail'];
$sharpSpringService = new SharpSpringService('[redacted]', '[redacted]'); //this is where the code chokes
$return = [];
if($contactEmail != null && $contactEmail !=""){
$lists = $sharpSpringService->makeCall('getListMemberships', [
'emailAddress' => $contactEmail,
]);
if (count($lists) > 0) {
$listArray = json_decode(json_encode($lists), true);
$inNewsList = false;
foreach($listArray as $list){
if($list = $newsListID){
//the user is subscribed to the news list
$inNewsList = true;
$converted_result = ($inNewsList) ? 'true' : 'false';
}
}
}
$return[] = array(
"status" => $converted_result,
"list" => $listName
);
return json_encode($return);
}
else{
return $return;
}
die();
}

Answer 1

For calling numerous files, it is sometimes convenient to define a constant:
define( 'MY_PLUGIN_PATH', plugin_dir_path( __FILE__ ) );
include( MY_PLUGIN_PATH . 'includes/admin-page.php');
include( MY_PLUGIN_PATH . 'includes/classes.php');