class AuthClient {
  constructor(username, clientId, clientSecretId, grantType = "client_credentials") {
    this.url = 'https://auth.developers.ar.ua.la/v2/api/auth/token';
    this.payload = {
      username: username,
      client_id: clientId,
      client_secret_id: clientSecretId,
      grant_type: grantType
    };
  }
 
  async getToken() {
    const options = {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify(this.payload)
    };
 
    try {
      const response = await fetch(this.url, options);
      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`);
      }
      const data = await response.json();
      return data;
    } catch (error) {
      console.error('Error:', error);
      throw error;
    }
  }
}
 
// Uso del constructor
const username = 'username';
const clientId = 'clientId';
const clientSecretId = 'clientSecretId';
 
const authClient = new AuthClient(username, clientId, clientSecretId);
 
authClient.getToken()
  .then(token => {
    console.log('Token:', token);
  })
  .catch(error => {
    console.error('Error:', error);
  });