curl --request POST \
  --url https://loadbalancer.{region}.basaltic.sh/v1/load-balancers/{id}/listeners/{listener_id}/certificates \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "certificate": "crn:certificate::my-account:certificate/prod-web",
  "is_default": true
}
'

import requests

url = "https://loadbalancer.{region}.basaltic.sh/v1/load-balancers/{id}/listeners/{listener_id}/certificates"

payload = {
    "certificate": "crn:certificate::my-account:certificate/prod-web",
    "is_default": True
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    certificate: 'crn:certificate::my-account:certificate/prod-web',
    is_default: true
  })
};

fetch('https://loadbalancer.{region}.basaltic.sh/v1/load-balancers/{id}/listeners/{listener_id}/certificates', 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://loadbalancer.{region}.basaltic.sh/v1/load-balancers/{id}/listeners/{listener_id}/certificates",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'certificate' => 'crn:certificate::my-account:certificate/prod-web',
    'is_default' => true
  ]),
  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://loadbalancer.{region}.basaltic.sh/v1/load-balancers/{id}/listeners/{listener_id}/certificates"

	payload := strings.NewReader("{\n  \"certificate\": \"crn:certificate::my-account:certificate/prod-web\",\n  \"is_default\": true\n}")

	req, _ := http.NewRequest("POST", 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.post("https://loadbalancer.{region}.basaltic.sh/v1/load-balancers/{id}/listeners/{listener_id}/certificates")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"certificate\": \"crn:certificate::my-account:certificate/prod-web\",\n  \"is_default\": true\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://loadbalancer.{region}.basaltic.sh/v1/load-balancers/{id}/listeners/{listener_id}/certificates")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"certificate\": \"crn:certificate::my-account:certificate/prod-web\",\n  \"is_default\": true\n}"

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

{
  "listener": {
    "crn": "<string>",
    "id": "e1f2a3b4-c5d6-4789-e0f1-a2b3c4d5e6f7",
    "load_balancer_id": "4e1f8c2a-9b3d-4f6e-8a1c-2d5e7f9a0b3c",
    "protocol": "https",
    "port": 443,
    "exposure": "both",
    "tags": {
      "environment": "production",
      "team": "backend"
    },
    "created_at": "2026-01-15T09:30:00Z",
    "updated_at": "2026-01-15T09:30:00Z",
    "certificates": [
      {
        "id": "f2a3b4c5-d6e7-4890-f1a2-b3c4d5e6f7a8",
        "certificate_crn": "crn:certificate::my-account:certificate/prod-web",
        "is_default": true,
        "created_at": "2026-01-15T09:30:00Z",
        "updated_at": "2026-01-15T09:30:00Z"
      }
    ],
    "default_target_group_id": "b8c9d0e1-f2a3-4456-b7c8-d9e0f1a2b3c4"
  }
}

{
  "error": {
    "code": "INVALID_INPUT",
    "message": "Invalid request parameters",
    "request_id": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "UNAUTHORIZED",
    "message": "Authentication required",
    "request_id": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "ACCESS_DENIED",
    "message": "You don't have permission to perform this action",
    "request_id": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "NOT_FOUND",
    "message": "Resource not found",
    "request_id": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "CONFLICT",
    "message": "Resource with this name already exists",
    "request_id": "550e8400-e29b-41d4-a716-446655440000"
  }
}

{
  "error": {
    "code": "IDEMPOTENCY_KEY_REUSED",
    "message": "This Idempotency-Key was already used with a different request payload",
    "request_id": "550e8400-e29b-41d4-a716-446655440000"
  }
}