curl --request POST \
  --url https://{projectId}.frontendapi.corbado.io/v2/auth/passkey/append/start \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "clientInformation": {
    "bluetoothAvailable": true,
    "clientEnvHandle": "<string>",
    "visitorId": "<string>",
    "canUsePasskeys": true,
    "isUserVerifyingPlatformAuthenticatorAvailable": true,
    "isConditionalMediationAvailable": true,
    "clientCapabilities": {
      "conditionalCreate": true,
      "conditionalMediation": true,
      "conditionalGet": true,
      "hybridTransport": true,
      "passkeyPlatformAuthenticator": true,
      "userVerifyingPlatformAuthenticator": true,
      "relatedOrigins": true,
      "signalAllAcceptedCredentials": true,
      "signalCurrentUserDetails": true,
      "signalUnknownCredential": true
    },
    "isNative": true,
    "webdriver": true,
    "privateMode": true
  }
}
'

import requests

url = "https://{projectId}.frontendapi.corbado.io/v2/auth/passkey/append/start"

payload = { "clientInformation": {
        "bluetoothAvailable": True,
        "clientEnvHandle": "<string>",
        "visitorId": "<string>",
        "canUsePasskeys": True,
        "isUserVerifyingPlatformAuthenticatorAvailable": True,
        "isConditionalMediationAvailable": True,
        "clientCapabilities": {
            "conditionalCreate": True,
            "conditionalMediation": True,
            "conditionalGet": True,
            "hybridTransport": True,
            "passkeyPlatformAuthenticator": True,
            "userVerifyingPlatformAuthenticator": True,
            "relatedOrigins": True,
            "signalAllAcceptedCredentials": True,
            "signalCurrentUserDetails": True,
            "signalUnknownCredential": True
        },
        "isNative": True,
        "webdriver": True,
        "privateMode": 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({
    clientInformation: {
      bluetoothAvailable: true,
      clientEnvHandle: '<string>',
      visitorId: '<string>',
      canUsePasskeys: true,
      isUserVerifyingPlatformAuthenticatorAvailable: true,
      isConditionalMediationAvailable: true,
      clientCapabilities: {
        conditionalCreate: true,
        conditionalMediation: true,
        conditionalGet: true,
        hybridTransport: true,
        passkeyPlatformAuthenticator: true,
        userVerifyingPlatformAuthenticator: true,
        relatedOrigins: true,
        signalAllAcceptedCredentials: true,
        signalCurrentUserDetails: true,
        signalUnknownCredential: true
      },
      isNative: true,
      webdriver: true,
      privateMode: true
    }
  })
};

fetch('https://{projectId}.frontendapi.corbado.io/v2/auth/passkey/append/start', 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://{projectId}.frontendapi.corbado.io/v2/auth/passkey/append/start",
  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([
    'clientInformation' => [
        'bluetoothAvailable' => true,
        'clientEnvHandle' => '<string>',
        'visitorId' => '<string>',
        'canUsePasskeys' => true,
        'isUserVerifyingPlatformAuthenticatorAvailable' => true,
        'isConditionalMediationAvailable' => true,
        'clientCapabilities' => [
                'conditionalCreate' => true,
                'conditionalMediation' => true,
                'conditionalGet' => true,
                'hybridTransport' => true,
                'passkeyPlatformAuthenticator' => true,
                'userVerifyingPlatformAuthenticator' => true,
                'relatedOrigins' => true,
                'signalAllAcceptedCredentials' => true,
                'signalCurrentUserDetails' => true,
                'signalUnknownCredential' => true
        ],
        'isNative' => true,
        'webdriver' => true,
        'privateMode' => 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://{projectId}.frontendapi.corbado.io/v2/auth/passkey/append/start"

	payload := strings.NewReader("{\n  \"clientInformation\": {\n    \"bluetoothAvailable\": true,\n    \"clientEnvHandle\": \"<string>\",\n    \"visitorId\": \"<string>\",\n    \"canUsePasskeys\": true,\n    \"isUserVerifyingPlatformAuthenticatorAvailable\": true,\n    \"isConditionalMediationAvailable\": true,\n    \"clientCapabilities\": {\n      \"conditionalCreate\": true,\n      \"conditionalMediation\": true,\n      \"conditionalGet\": true,\n      \"hybridTransport\": true,\n      \"passkeyPlatformAuthenticator\": true,\n      \"userVerifyingPlatformAuthenticator\": true,\n      \"relatedOrigins\": true,\n      \"signalAllAcceptedCredentials\": true,\n      \"signalCurrentUserDetails\": true,\n      \"signalUnknownCredential\": true\n    },\n    \"isNative\": true,\n    \"webdriver\": true,\n    \"privateMode\": true\n  }\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://{projectId}.frontendapi.corbado.io/v2/auth/passkey/append/start")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"clientInformation\": {\n    \"bluetoothAvailable\": true,\n    \"clientEnvHandle\": \"<string>\",\n    \"visitorId\": \"<string>\",\n    \"canUsePasskeys\": true,\n    \"isUserVerifyingPlatformAuthenticatorAvailable\": true,\n    \"isConditionalMediationAvailable\": true,\n    \"clientCapabilities\": {\n      \"conditionalCreate\": true,\n      \"conditionalMediation\": true,\n      \"conditionalGet\": true,\n      \"hybridTransport\": true,\n      \"passkeyPlatformAuthenticator\": true,\n      \"userVerifyingPlatformAuthenticator\": true,\n      \"relatedOrigins\": true,\n      \"signalAllAcceptedCredentials\": true,\n      \"signalCurrentUserDetails\": true,\n      \"signalUnknownCredential\": true\n    },\n    \"isNative\": true,\n    \"webdriver\": true,\n    \"privateMode\": true\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{projectId}.frontendapi.corbado.io/v2/auth/passkey/append/start")

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  \"clientInformation\": {\n    \"bluetoothAvailable\": true,\n    \"clientEnvHandle\": \"<string>\",\n    \"visitorId\": \"<string>\",\n    \"canUsePasskeys\": true,\n    \"isUserVerifyingPlatformAuthenticatorAvailable\": true,\n    \"isConditionalMediationAvailable\": true,\n    \"clientCapabilities\": {\n      \"conditionalCreate\": true,\n      \"conditionalMediation\": true,\n      \"conditionalGet\": true,\n      \"hybridTransport\": true,\n      \"passkeyPlatformAuthenticator\": true,\n      \"userVerifyingPlatformAuthenticator\": true,\n      \"relatedOrigins\": true,\n      \"signalAllAcceptedCredentials\": true,\n      \"signalCurrentUserDetails\": true,\n      \"signalUnknownCredential\": true\n    },\n    \"isNative\": true,\n    \"webdriver\": true,\n    \"privateMode\": true\n  }\n}"

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

{
  "blockBody": {
    "data": {
      "blockType": "<string>",
      "challenge": "<string>",
      "identifierValue": "<string>",
      "autoSubmit": true
    },
    "alternatives": "<array>",
    "error": {
      "code": "<string>",
      "message": "<string>"
    },
    "continueOnOtherDevice": {}
  },
  "common": {
    "appName": "<string>",
    "frontendApiUrl": "<string>",
    "hideBadge": true,
    "environment": "<string>"
  },
  "newProcess": {
    "token": "<string>",
    "expiresAt": 123
  }
}