App to get and show accessToken send by Cloud Function

App.tsx

import { StatusBar } from 'expo-status-bar';
import { StyleSheet, Text, View } from 'react-native';
import { useEffect, useState } from 'react';
import functions from '@react-native-firebase/functions';

export default function App() {
  const [token, setToken] = useState<string | null>(null);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    const fetchToken = async () => {
      try {
        const callableMetal = functions().httpsCallable('getMetalcodeAccessToken');
        const resultMetal = await callableMetal();
        const fetchedTokenMetal = resultMetal.data.token;
        console.log('Token obtido:', fetchedTokenMetal); // Log do token
        setToken(fetchedTokenMetal); // Armazena o token no estado
      } catch (err) {
        console.error('Erro ao obter o token:', err);
        setError('Falha ao obter o token');
      }
    };

    fetchToken();
  }, []);

  return (
    <View style={styles.container}>
      <Text>Open up App.tsx to start working on your app!</Text>
      {token ? (
        <Text>Token: {token}</Text>
      ) : error ? (
        <Text style={styles.error}>{error}</Text>
      ) : (
        <Text>Carregando token...</Text>
      )}
      <StatusBar style="auto" />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
  error: {
    color: 'red',
  },
});