curl --request POST \
  --url https://api.qbank.cl/platform/v1/wallet-links/challenges \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "chain": "eth",
  "address": "0x71C7656EC7ab88b098defB751B7401B5f6d8976F"
}
'

import requests

url = "https://api.qbank.cl/platform/v1/wallet-links/challenges"

payload = {
    "chain": "eth",
    "address": "0x71C7656EC7ab88b098defB751B7401B5f6d8976F"
}
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({chain: 'eth', address: '0x71C7656EC7ab88b098defB751B7401B5f6d8976F'})
};

fetch('https://api.qbank.cl/platform/v1/wallet-links/challenges', 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.qbank.cl/platform/v1/wallet-links/challenges",
  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([
    'chain' => 'eth',
    'address' => '0x71C7656EC7ab88b098defB751B7401B5f6d8976F'
  ]),
  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.qbank.cl/platform/v1/wallet-links/challenges"

	payload := strings.NewReader("{\n  \"chain\": \"eth\",\n  \"address\": \"0x71C7656EC7ab88b098defB751B7401B5f6d8976F\"\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://api.qbank.cl/platform/v1/wallet-links/challenges")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"chain\": \"eth\",\n  \"address\": \"0x71C7656EC7ab88b098defB751B7401B5f6d8976F\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.qbank.cl/platform/v1/wallet-links/challenges")

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  \"chain\": \"eth\",\n  \"address\": \"0x71C7656EC7ab88b098defB751B7401B5f6d8976F\"\n}"

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

{
  "challenge": {
    "link_id": "d52e7b91-4c68-4f89-1b23-5d7e9f0a2c46",
    "chain": "eth",
    "address": "0x71C7656EC7ab88b098defB751B7401B5f6d8976F",
    "nonce": "9f2c41d2a887f3e4b219c6d2e8f1a5b7",
    "envelope": "CBPay Signature Proof\nDomain: https://api.qbank.cl/platform\nPurpose: wallet_link\nWallet: 0x71C7656EC7ab88b098defB751B7401B5f6d8976F\nAccount: ae8c1f02-3b45-4c67-9d12-8f0e5a6b7c8d\nNonce: 9f2c41d2a887f3e4b219c6d2e8f1a5b7\nIssued: 2026-08-21T14:03:11Z\nExpires: 2026-08-21T14:13:11Z",
    "expires_at": "2026-08-21T14:13:11Z"
  }
}

{
  "error": "invalid_address",
  "message": "the address is not valid for the chain"
}

{
  "error": "nonce_failed",
  "message": "could not generate the challenge nonce"
}