simpleussdideamart.php

    function reciveUssd() {
        $array = json_decode(file_get_contents('php://input'), true);

        if (!((isset($array['sourceAddress']) && isset($array['message'])))) {
            throw new Exception("Some of the required parameters are not provided");
        } else {
            $responses = array("statusCode" => "S1000", "statusDetail" => "Success");
            header("Content-type: application/json");
            echo json_encode($responses);
        }
    }

    function sendUssd($server,$applicationId,$password,$destinationAddress,$message,$sessionId,$ussdOperation){
      
        $arrayField = array("applicationId" => $applicationId,
            "password" => $password,
            "message" => $message,
            "destinationAddress" => $destinationAddress,
            "sessionId" => $sessionId,
            "ussdOperation" => $ussdOperation,
            "encoding" => "440"
			  );
        
        $ch = curl_init($server);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($arrayField));
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        $res = curl_exec($ch); 
        curl_close($ch);

        return $res;
    }