Get access token

import requests
import json

url = "https://api-sandbox.contasimples.com/oauth/v1/access-token"
headers = {
  "Content-Type": "application/x-www-form-urlencoded",
  "Authorization": "Basic YOUR_CREDENTIALS"
}
data = {
  "grant_type": "client_credentials"
}

response = requests.post(url, headers=headers, data=data)
print(response.json())

const params = new URLSearchParams();
params.append("grant_type", "client_credentials");

const response = await fetch("https://api-sandbox.contasimples.com/oauth/v1/access-token", {
  method: "POST",
  headers: {
  "Content-Type": "application/x-www-form-urlencoded",
  "Authorization": "Basic YOUR_CREDENTIALS"
},
  body: params
});

const data = await response.json();
console.log(data);

package main

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

func main() {
    data := url.Values{}
    data.Set("grant_type", "client_credentials")

    req, err := http.NewRequest("POST", "https://api-sandbox.contasimples.com/oauth/v1/access-token", strings.NewReader(data.Encode()))
    if err != nil {
        panic(err)
    }

    req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
    req.Header.Set("Authorization", "Basic YOUR_CREDENTIALS")

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    fmt.Println("Response Status:", resp.Status)
}

require 'net/http'
require 'json'

uri = URI('https://api-sandbox.contasimples.com/oauth/v1/access-token')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/x-www-form-urlencoded'
request['Authorization'] = 'Basic YOUR_CREDENTIALS'
request.set_form([
  ["grant_type", "client_credentials"]
], 'application/x-www-form-urlencoded')

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

{
  "error": "Bad Request",
  "message": "The request contains invalid parameters or malformed data",
  "code": 400,
  "details": [
    {
      "field": "email",
      "message": "Invalid email format"
    }
  ]
}

{
  "error": "Unauthorized",
  "message": "Authentication required. Please provide a valid API token",
  "code": 401
}

{
  "error": "Not Found",
  "message": "The requested resource was not found",
  "code": 404
}

{
  "error": "Internal Server Error",
  "message": "An unexpected error occurred on the server",
  "code": 500,
  "requestId": "req_1234567890"
}