アプリ内課金の発生時にSlack通知する

firebase_cloud_functions_send_slack_when_purchased.ts

import * as functions from "firebase-functions";
import * as request from "request";

exports.sendSlackMessageOnPurchaseCoin = functions
  .region("asia-northeast1")
  .analytics.event("in_app_purchase_coins")
  .onLog((event) => sentMessageToSlack(event, "コインが購入されました"));

exports.sendSlackMessageOnPurchaseSubscription = functions
  .region("asia-northeast1")
  .analytics.event("in_app_purchase_subscription")
  .onLog((event) => sentMessageToSlack(event, "サブスクが購入されました"));

const sentMessageToSlack = (
  event: functions.analytics.AnalyticsEvent,
  message: string
): request.Request => {
  const url = functions.config().slack.url;
  const user = event.user;
  const purchaseValue = event.valueInUSD; // Amount of the purchase in USD.
  const userLanguage = user?.deviceInfo.userDefaultLanguage; // The user language in language-country format.
  const screenName = event.params["firebase_screen_class"];

  return request.post(url, {
    json: {
      text:
        `${message}💰 $${purchaseValue} \n` +
        "```\n" +
        `at time: ${event.logTime} \n` +
        `lang: ${userLanguage} \n` +
        `country: ${event.user?.geoInfo.country} \n` +
        `model: ${event.user?.deviceInfo?.mobileModelName} \n` +
        `appId: ${event.user?.appInfo?.appId} \n` +
        `appVersion: ${event.user?.appInfo?.appVersion} \n` +
        `screen: ${screenName} \n` +
        "```\n",
    },
  });
};