Get account balance

You can use the API to check your account balance.
https://api-eu1.stannp.com/v1/accounts/balance
Request 
$ curl https://api-eu1.stannp.com/v1/accounts/balance \
-u {API_KEY}:

define("API_KEY", "YOUR API KEY");
$opts = array(
    'http' => array(
        'method'  => 'GET',
        'header'  => 'Content-type: application/x-www-form-urlencoded'
    )
);
$context  = stream_context_create($opts);
$result = file_get_contents("https://api-eu1.stannp.com/v1/accounts/balance?api_key=" . API_KEY, false, $context);
$response = json_decode($result, true);

print_r($response);

import requests

response = requests.get('https://api-eu1.stannp.com/v1/accounts/balance?api_key={API_KEY}')
print(response.text)

var client = new RestClient("https://api-eu1.stannp.com/v1/accounts/balance?api_key={API_KEY}");

var request = new RestRequest(Method.GET);
IRestResponse response = client.Execute(request);

Console.WriteLine(response.Content);
Response 
{
    "success":true,
    "data": {
        "balance":"214.42"
    }
}

Top up balance

You can use the API to top up your balance if you have a saved card and set one to default.
https://api-eu1.stannp.com/v1/accounts/topup

Parameters

net mandatory The amount to top up. Eg: "10.00". Be aware tax may be added on after.
Request 
$ curl https://api-eu1.stannp.com/v1/accounts/topup \
-u {API_KEY}: \
-d "net=10.00"

$curl = curl_init();

curl_setopt_array($curl, array(
    CURLOPT_URL => 'https://api-eu1.stannp.com/v1/accounts/topup?api_key={API_KEY}',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => '',
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 0,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => 'POST',
    CURLOPT_POSTFIELDS => array(
        'net' => "10.00"
    ),
));

$response = curl_exec($curl);

curl_close($curl);
print_r($response);

import requests

data = {
    'net': '10.00'
}

response = requests.post('https://api-eu1.stannp.com/v1/accounts/topup?api_key={API_KEY}', data=data)
print(response.text)

var client = new RestClient("https://api-eu1.stannp.com/v1/accounts/topup?api_key={API_KEY}");

var request = new RestRequest(Method.POST);

request.AddParameter("net", "10.00");

IRestResponse response = client.Execute(request);
Console.WriteLine(response.Content)
Response 
{
   "success":true,
   "data":{
      "receipt_pdf":"https://www.stannp.com/invoice/12345-uhusdsfsi34545-fgfdfdb.pdf"
   }
}