fetch(global.api_url + 'auth/login', {
            method: 'POST',
            headers: {
                Accept: 'application/json',
                // 'Content-Type': 'application/json',
            },
            body: JSON.stringify({
                // deviceKey: token,
                username: username,
                password: password,
            }),
        }).then((response) => response.json())
            .then((responseJson) => {
                if(responseJson.status == 'error'){
                    alert(responseJson.message);
                }
                if(responseJson.status == 'success' && responseJson.api_key){
                    AsyncStorage.setItem('user', responseJson.user);
                    AsyncStorage.setItem('userToken', responseJson.api_key.api_key);
                    this.props.navigation.navigate('App');
                }
                alert(responseJson.data);
            })
            .catch((error) => {
                console.error(error);
                alert('An error has occured, please try again.')
            });

        await this.setState({isLoading: false});
        return;