This runs as a stdlib.com serverless function (built with the code.xyz IDE)

__main__.js

const axios = require("axios");
const R = require("ramda");

module.exports = async (latitude = 0, longitude = 0) => {
  const { data } = await axios.get("https://api.foursquare.com/v2/venues/explore", {
    params: {
      client_id: process.env.FOURSQUARE_CLIENT_ID,
      client_secret: process.env.FOURSQUARE_CLIENT_SECRET,
      v: 20180707,
      section: "coffee",
      limit: 3,
      ll: `${latitude.toFixed(2)},${longitude.toFixed(2)}`
    }
  });

  const recommendations = R.path(["response", "groups", 0, "items"], data);

  if (!recommendations || recommendations.length === 0) {
    return { messages: [{ text: "Sorry, no recommendations for you! :(" }] };
  }

  const venueIds = R.map(R.path(["venue", "id"]), recommendations);

  const queries = venueIds.map(id =>
    axios.get(`https://api.foursquare.com/v2/venues/${id}`, {
      params: {
        client_id: process.env.FOURSQUARE_CLIENT_ID,
        client_secret: process.env.FOURSQUARE_CLIENT_SECRET,
        v: 20180707
      }
    })
  );

  const fullResults = await Promise.all(queries);

  const payload = fullResults.map(res => {
    const details = R.path(["data", "response", "venue"], res);
    const photo = R.path(["photos", "groups", 0, "items", 0], details);

    return {
      title: details.name,
      subtitle: "Rated " + R.propOr("unknown", "rating", details) + " " + R.path(["hours", "status"], details),
      image_url: photo && photo.prefix + "400x400" + photo.suffix,
      buttons: [
        {
          type: "web_url",
          url: details.canonicalUrl,
          title: "View on Foursquare"
        }
      ]
    };
  });

  return {
    messages: [
      {
        attachment: {
          type: "template",
          payload: {
            template_type: "generic",
            image_aspect_ratio: "square",
            elements: payload
          }
        }
      }
    ]
  };
};