curl --request POST \
  --url https://api.gcore.com/cloud/v1/routers/{project_id}/{region_id}/{router_id}/attach \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "subnet_id": "<string>",
  "ip_address": "<string>"
}
'

import requests

url = "https://api.gcore.com/cloud/v1/routers/{project_id}/{region_id}/{router_id}/attach"

payload = {
    "subnet_id": "<string>",
    "ip_address": "<string>"
}
headers = {
    "Authorization": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({subnet_id: '<string>', ip_address: '<string>'})
};

fetch('https://api.gcore.com/cloud/v1/routers/{project_id}/{region_id}/{router_id}/attach', 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.gcore.com/cloud/v1/routers/{project_id}/{region_id}/{router_id}/attach",
  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([
    'subnet_id' => '<string>',
    'ip_address' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <api-key>",
    "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.gcore.com/cloud/v1/routers/{project_id}/{region_id}/{router_id}/attach"

	payload := strings.NewReader("{\n  \"subnet_id\": \"<string>\",\n  \"ip_address\": \"<string>\"\n}")

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

	req.Header.Add("Authorization", "<api-key>")
	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://api.gcore.com/cloud/v1/routers/{project_id}/{region_id}/{router_id}/attach")
  .header("Authorization", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"subnet_id\": \"<string>\",\n  \"ip_address\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.gcore.com/cloud/v1/routers/{project_id}/{region_id}/{router_id}/attach")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"subnet_id\": \"<string>\",\n  \"ip_address\": \"<string>\"\n}"

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

{
  "created_at": "2023-11-07T05:31:56Z",
  "distributed": true,
  "id": "<string>",
  "interfaces": [
    {
      "ip_assignments": [
        {
          "ip_address": "192.168.123.20",
          "subnet_id": "351b0dd7-ca09-431c-be53-935db3785067"
        },
        {
          "ip_address": "192.168.120.16",
          "subnet_id": "0a641ef8-62dc-4146-91e5-6ab4b464df6d"
        }
      ],
      "network_id": "bc688791-f1b0-44eb-97d4-07697294b1e1",
      "port_id": "1f0ca628-a73b-42c0-bdac-7b10d023e097",
      "mac_address": "00:16:3e:f2:87:16"
    }
  ],
  "name": "<string>",
  "project_id": 1337,
  "region": "Luxembourg 1",
  "region_id": 7,
  "routes": [
    {
      "destination": "10.0.3.0/24",
      "nexthop": "10.0.0.13"
    }
  ],
  "status": "<string>",
  "task_id": "<string>",
  "updated_at": "2023-11-07T05:31:56Z",
  "creator_task_id": "<string>",
  "external_gateway_info": {
    "enable_snat": true,
    "external_fixed_ips": [
      {
        "ip_address": "172.24.4.6",
        "subnet_id": "b930d7f6-ceb7-40a0-8b81-a425dd994ccf"
      }
    ],
    "network_id": "ae34051f-aa6c-4c75-abf5-50dc9ac99ef3"
  }
}