Print data via GET https://api.groovehq.com/v1/tickets - json

Question

I'm trying to get data trough a JSON API from Groove.
https://www.groovehq.com/docs/tickets#listing-tickets
and https://www.groovehq.com/docs
This is the code I made:
<?php
function timjson_front($atts, $content) {
global $wpdb;
$access_token = ""; //insert token
$user_email = ""; // insert customers email
$json = getJSON($access_token, $user_email);
$html = "";
foreach($json as $key => $waarde) {
$html .= $key . ' = ' . $waarde;
}
return html_entity_decode($html);
}
function getJSON($access_token, $user_email) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_URL, 'https://api.groovehq.com/v1/tickets?acces_token=' . $access_token . '&customer=' . $user_email);
$result = curl_exec($ch);
curl_close($ch);
$obj = json_decode($result);
return $obj;
}
?>
The code runs on a wordpress page and is part of a self made plugin. The idea is that the tickets from a customer gets printed on a page.
Wordpress gives a error at foreach(). Does anyone know what i'm doing wrong? Or has some advice?

Answer 1

First
You're iterating on $obj but $obj = json_decode($result); will returns an object. You need to iterate through an array so use json_decode($result, true)
Second
Based on the API, the first key is tickets and has multiple tickets
So you want to start with tickets in the foreach:
foreach($json['tickets'] as $ticket){
foreach($ticket as $key => $waarde) {
$html .= $key . ' = ' . $waarde;
}
}
Third
You're concatenating strings with $html .= $key . ' = ' . $waarde;
But based on the API, the values are not ALWAYS strings.
foreach($json['tickets'] as $ticket){
foreach($ticket as $key => $waarde) {
if(!in_array($key, ['tags','links'])){ // ignore the keys "tags" and "links" because they are array
$html .= $key . ' = ' . $waarde;
}
}
}
Edit: POC https://3v4l.org/dblmj