LAGO_URL="https://api.getlago.com"
API_KEY="__YOUR_API_KEY__"
EXTERNAL_CUSTOMER_ID="__EXTERNAL_CUSTOMER_ID__"
EXTERNAL_SUBSCRIPTION_ID="__EXTERNAL_SUBSCRIPTION_ID__"

curl --location --request GET "$LAGO_URL/api/v1/customers/$EXTERNAL_CUSTOMER_ID/current_usage?external_subscription_id=$EXTERNAL_SUBSCRIPTION_ID" \
--header "Authorization: Bearer $API_KEY" \
--header 'Content-Type: application/json'

from lago_python_client.client import Client
from lago_python_client.exceptions import LagoApiError

client = Client(api_key='__YOUR_API_KEY__')

customer_usage = None
try:
    customer_usage = client.customers.current_usage('external_customer_id', 'external_subscription_id')
except LagoApiError as e:
    repair_broken_state(e)  # do something on error or raise your own exception

require 'lago-ruby-client'

client = Lago::Api::Client.new({api_key: '__YOUR_API_KEY__'})
customer_usage = client.customer.current_usage(
  'external_customer_id', 'external_subscription_id'
)

await client.customers.findCustomerCurrentUsage(
  "customer_external_id",
  { external_subscription_id: "external_subscription_id" }
);

  import "fmt"
  import "github.com/getlago/lago-go-client"

  func main() {
    lagoClient := lago.New().
      SetApiKey("__YOUR_API_KEY__")

    customerUsage, err := lagoClient.Customer().CurrentUsage("__YOUR_CUSTOMER_ID__")
    if err != nil {
      // Error is *lago.Error
      panic(err)
    }

    // customerUsage is *lago.CustomerUsage
    fmt.Println(customerUsage)
  }

using System.Collections.Generic;
using System.Diagnostics;
using Org.OpenAPITools.Api;
using Org.OpenAPITools.Client;
using Org.OpenAPITools.Model;

namespace Example
{
  public class FindCustomerCurrentUsageExample
  {
      public static void Main()
      {
          Configuration.Default.BasePath = "https://api.getlago.com/api/v1";
          // Configure HTTP bearer authorization: bearerAuth
          Configuration.Default.AccessToken = "YOUR_ACCESS_TOKEN";

          var apiInstance = new CustomersApi(Configuration.Default);
          var customerExternalId = "12345";  // string | External ID of the existing customer
          var externalSubscriptionId = "54321";  // string | External subscription ID

          try
          {
              // Find customer current usage
              CustomerUsage result = apiInstance.FindCustomerCurrentUsage(customerExternalId, externalSubscriptionId);
              Debug.WriteLine(result);
          }
          catch (ApiException e)
          {
              Debug.Print("Exception when calling CustomersApi.FindCustomerCurrentUsage: " + e.Message );
              Debug.Print("Status Code: "+ e.ErrorCode);
              Debug.Print(e.StackTrace);
          }
      }
  }
}

<?php
require_once(__DIR__ . '/vendor/autoload.php');


// Configure Bearer authorization: bearerAuth
$config = OpenAPI\Client\Configuration::getDefaultConfiguration()->setAccessToken('YOUR_ACCESS_TOKEN');


$apiInstance = new OpenAPI\Client\Api\CustomersApi(
  // If you want use custom http client, pass your client which implements `GuzzleHttp\ClientInterface`.
  // This is optional, `GuzzleHttp\Client` will be used as default.
  new GuzzleHttp\Client(),
  $config
);
$customer_external_id = "12345"; // string | External ID of the existing customer
$external_subscription_id = "54321"; // string | External subscription ID

try {
  $result = $apiInstance->findCustomerCurrentUsage($customer_external_id, $external_subscription_id);
  print_r($result);
} catch (Exception $e) {
  echo 'Exception when calling CustomersApi->findCustomerCurrentUsage: ', $e->getMessage(), PHP_EOL;
}