curl --request PUT \
  --url https://api.getlago.com/api/v1/subscriptions/{external_id}/alerts/{code} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "alert": {
    "code": "storage_threshold_alert",
    "name": "Storage Usage Alert",
    "thresholds": [
      {
        "value": 99,
        "code": "warn",
        "recurring": false
      }
    ],
    "billable_metric_code": "storage_usage"
  }
}
'

import requests

url = "https://api.getlago.com/api/v1/subscriptions/{external_id}/alerts/{code}"

payload = { "alert": {
        "code": "storage_threshold_alert",
        "name": "Storage Usage Alert",
        "thresholds": [
            {
                "value": 99,
                "code": "warn",
                "recurring": False
            }
        ],
        "billable_metric_code": "storage_usage"
    } }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.put(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'PUT',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    alert: {
      code: 'storage_threshold_alert',
      name: 'Storage Usage Alert',
      thresholds: [{value: 99, code: 'warn', recurring: false}],
      billable_metric_code: 'storage_usage'
    }
  })
};

fetch('https://api.getlago.com/api/v1/subscriptions/{external_id}/alerts/{code}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.getlago.com/api/v1/subscriptions/{external_id}/alerts/{code}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_POSTFIELDS => json_encode([
    'alert' => [
        'code' => 'storage_threshold_alert',
        'name' => 'Storage Usage Alert',
        'thresholds' => [
                [
                                'value' => 99,
                                'code' => 'warn',
                                'recurring' => false
                ]
        ],
        'billable_metric_code' => 'storage_usage'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.getlago.com/api/v1/subscriptions/{external_id}/alerts/{code}"

	payload := strings.NewReader("{\n  \"alert\": {\n    \"code\": \"storage_threshold_alert\",\n    \"name\": \"Storage Usage Alert\",\n    \"thresholds\": [\n      {\n        \"value\": 99,\n        \"code\": \"warn\",\n        \"recurring\": false\n      }\n    ],\n    \"billable_metric_code\": \"storage_usage\"\n  }\n}")

	req, _ := http.NewRequest("PUT", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.put("https://api.getlago.com/api/v1/subscriptions/{external_id}/alerts/{code}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"alert\": {\n    \"code\": \"storage_threshold_alert\",\n    \"name\": \"Storage Usage Alert\",\n    \"thresholds\": [\n      {\n        \"value\": 99,\n        \"code\": \"warn\",\n        \"recurring\": false\n      }\n    ],\n    \"billable_metric_code\": \"storage_usage\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.getlago.com/api/v1/subscriptions/{external_id}/alerts/{code}")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Put.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"alert\": {\n    \"code\": \"storage_threshold_alert\",\n    \"name\": \"Storage Usage Alert\",\n    \"thresholds\": [\n      {\n        \"value\": 99,\n        \"code\": \"warn\",\n        \"recurring\": false\n      }\n    ],\n    \"billable_metric_code\": \"storage_usage\"\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "alert": {
    "lago_id": "1a901a90-1a90-1a90-1a90-1a901a901a90",
    "lago_organization_id": "1a901a90-1a90-1a90-1a90-1a901a901a90",
    "external_subscription_id": "sub_1234567890",
    "billable_metric": {
      "lago_id": "1a901a90-1a90-1a90-1a90-1a901a901a90",
      "name": "Storage",
      "code": "storage",
      "recurring": false,
      "created_at": "2022-09-14T16:35:31Z",
      "aggregation_type": "sum_agg",
      "description": "GB of storage used in my application",
      "rounding_function": "round",
      "rounding_precision": 2,
      "expression": "round((ended_at - started_at) * units)",
      "field_name": "gb",
      "weighted_interval": "seconds",
      "filters": [
        {
          "key": "region",
          "values": [
            "us-east-1"
          ]
        }
      ]
    },
    "alert_type": "billable_metric_current_usage_amount",
    "code": "storage_threshold_alert",
    "name": "Storage Usage Alert",
    "previous_value": 1000,
    "last_processed_at": "2025-05-19T10:04:21Z",
    "thresholds": [
      {
        "code": "warn",
        "recurring": false,
        "value": "99.0"
      }
    ],
    "created_at": "2025-03-20T10:00:00Z",
    "lago_wallet_id": null,
    "wallet_code": null,
    "direction": "increasing"
  }
}

{
  "status": 400,
  "error": "Bad request"
}

{
  "status": 401,
  "error": "Unauthorized"
}

{
  "status": 404,
  "error": "Not Found",
  "code": "object_not_found"
}

{
  "status": 422,
  "error": "Unprocessable entity",
  "code": "validation_errors",
  "error_details": {}
}