getGcpInstanceToken.js

const axios = require('axios');

module.exports = async receivingServiceURL => {
    const axiosInstance = axios.create({
        baseURL: 'http://metadata.google.internal/',
        timeout: 10000,
        headers: {'Metadata-Flavor': 'Google'}
    });

    return axiosInstance.get(`computeMetadata/v1/instance/service-accounts/default/identity?audience=${receivingServiceURL}`).then(response => {
        return response.data;
    });
};