Cannot create an article with Bexio API in PHP - php

Question

I try to post an article to Bexio via the Bexio API: https://docs.bexio.com/resources/article/
There is also a sample for PHP: https://docs.bexio.com/samples/
I updated the scopes in the config.php to allow read and write articles.
I updates the bexioConnector.class.php so i can get Articles (works):
public function getArticles($urlParams = array()) {
return $this->call('article', $urlParams);
}
public function call($ressource, $urlParams = array(), $postParams = array(), $method = Curl::METHOD_GET) {
$url = $this->api_url . "/" . $this->org . "/" . $ressource;
$data = $this->curl->call($url, $urlParams, $postParams, $method, $this->getDefaultHeaders());
return json_decode($data, true);
}
So i can use now this code to get all articles (works):
$bexioProducts = $con->getArticles(array('order_by' => 'id'));
Now i want to create articles with the POST method.
So i added this function to the bexioConnector.class.php
public function postArticle($postParams = array(), $urlParams = array()) {
return $this->call('article', $urlParams, $postParams, Curl::METHOD_POST);
}
So i use this code to create a product:
$con->postArticle(array(
'intern_code' => "SKU-3214"
)
);
But this ends in an error:
{"error_code":415,"message":"Could not parse the data."}
I have tried a lot but i always get the same error message.
What could i have don possibly wrong?

Answer 1

I found the error. I need to encode it as a json first.
So i changed my postArticle function:
public function postArticle($postParams = array(), $urlParams = array()) {
$json = json_encode($postParams);
return $this->call('article', $urlParams, $json, Curl::METHOD_POST);
}