curl --request POST \
  --url https://compute.{region}.basaltic.sh/v1/instances/{instance_id}/nics \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "interface": "e8a1c2d3-4b5f-4a6e-9c0d-1e2f3a4b5c6d"
}
'

import requests

url = "https://compute.{region}.basaltic.sh/v1/instances/{instance_id}/nics"

payload = { "interface": "e8a1c2d3-4b5f-4a6e-9c0d-1e2f3a4b5c6d" }
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({interface: 'e8a1c2d3-4b5f-4a6e-9c0d-1e2f3a4b5c6d'})
};

fetch('https://compute.{region}.basaltic.sh/v1/instances/{instance_id}/nics', 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://compute.{region}.basaltic.sh/v1/instances/{instance_id}/nics",
  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([
    'interface' => 'e8a1c2d3-4b5f-4a6e-9c0d-1e2f3a4b5c6d'
  ]),
  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://compute.{region}.basaltic.sh/v1/instances/{instance_id}/nics"

	payload := strings.NewReader("{\n  \"interface\": \"e8a1c2d3-4b5f-4a6e-9c0d-1e2f3a4b5c6d\"\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://compute.{region}.basaltic.sh/v1/instances/{instance_id}/nics")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"interface\": \"e8a1c2d3-4b5f-4a6e-9c0d-1e2f3a4b5c6d\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://compute.{region}.basaltic.sh/v1/instances/{instance_id}/nics")

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  \"interface\": \"e8a1c2d3-4b5f-4a6e-9c0d-1e2f3a4b5c6d\"\n}"

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

{
  "attachment": {
    "interface_id": "e8a1c2d3-4b5f-4a6e-9c0d-1e2f3a4b5c6d",
    "mac": "02:1a:2b:3c:4d:5e",
    "boot_index": 0,
    "external": false,
    "restart_required": true,
    "addresses": [
      {
        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "family": "ipv4",
        "address": "<string>",
        "prefix": "<string>",
        "primary": true,
        "floating_ips": [
          {
            "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
            "crn": "<string>",
            "visibility": "public",
            "address": "<string>"
          }
        ]
      }
    ]
  }
}

{
  "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": "INVALID_INPUT",
    "message": "Invalid request parameters",
    "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"
  }
}