const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({message: '<string>', signature: '<string>', ttlInSeconds: 3600})
};

fetch('https://api.gnosispay.com/api/v1/auth/challenge', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

curl --request POST \
  --url https://api.gnosispay.com/api/v1/auth/challenge \
  --header 'Content-Type: application/json' \
  --data '
{
  "message": "<string>",
  "signature": "<string>",
  "ttlInSeconds": 3600
}
'

import requests

url = "https://api.gnosispay.com/api/v1/auth/challenge"

payload = {
    "message": "<string>",
    "signature": "<string>",
    "ttlInSeconds": 3600
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.gnosispay.com/api/v1/auth/challenge"

	payload := strings.NewReader("{\n  \"message\": \"<string>\",\n  \"signature\": \"<string>\",\n  \"ttlInSeconds\": 3600\n}")

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

	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.gnosispay.com/api/v1/auth/challenge")
  .header("Content-Type", "application/json")
  .body("{\n  \"message\": \"<string>\",\n  \"signature\": \"<string>\",\n  \"ttlInSeconds\": 3600\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.gnosispay.com/api/v1/auth/challenge")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"message\": \"<string>\",\n  \"signature\": \"<string>\",\n  \"ttlInSeconds\": 3600\n}"

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

{
  "token": "<string>"
}

{
  "error": "Internal server error"
}