Expiring card reminder email: template and code

{
  "name": "Expiring card reminders",
  "cancelation_token": "card-{{recipient}}",
  "nodes": [
    {
      "type": "trigger",
      "trigger_type": "api-invoke"
    },
    {
      "type": "send",
      "channel": "email",
      "message": {
        "template": "@card-expiring-email"
      }
    },
    {
      "type": "delay",
      "mode": "duration",
      "duration": "P23D"
    },
    {
      "type": "send",
      "channel": "email",
      "message": {
        "template": "@card-expiring-final-email"
      }
    },
    {
      "type": "send",
      "channel": "inbox",
      "message": {
        "template": "@card-expiring-final-inbox"
      }
    },
    {
      "type": "exit"
    }
  ]
}

// Creates this recipe's journey from journey.json and the templates/ folder,
// then publishes it. Run it once per workspace:
//
//   COURIER_API_KEY=pk_... node --experimental-strip-types setup.ts
//
// It prints the journey ID and the template IDs it created.
import Courier from "@trycourier/courier";
import { readFileSync, readdirSync } from "node:fs";

const client = new Courier();
const here = new URL(".", import.meta.url);
const readJson = (path: string) =>
  JSON.parse(readFileSync(new URL(path, here), "utf8"));

const spec = readJson("journey.json");

// 1. Create the journey, then the templates its send nodes use.
const journey = await client.journeys.create({
  name: spec.name,
  nodes: [spec.nodes[0], spec.nodes.at(-1)],
});

const templateIds: Record<string, string> = {};
for (const file of readdirSync(new URL("templates/", here))) {
  const key = file.replace(/\.json$/, "");
  const template = await client.journeys.templates.create(
    journey.id,
    readJson(`templates/${file}`)
  );
  await client.journeys.templates.publish(template.id, {
    templateId: journey.id,
  });
  templateIds[key] = template.id;
}

// 2. Save the nodes. In journey.json, "@<template>" stands for the ID of the
// template with that file name. Node IDs must be unique across a workspace,
// so any node ID journey.json names (used by "send_status.<id>" conditions)
// gets this journey's ID added.
const nodeIds = [
  ...JSON.stringify(spec.nodes).matchAll(/"id":"([\w-]+)"/g),
].map((m) => m[1]);
let nodes = JSON.stringify(spec.nodes).replace(/"@([\w-]+)"/g, (_, key) =>
  JSON.stringify(templateIds[key])
);
for (const id of nodeIds)
  nodes = nodes.replace(
    new RegExp(`(?<=[".])${id}(?=")`, "g"),
    `${id}-${journey.id}`
  );
await client.journeys.replace(journey.id, {
  name: spec.name,
  cancelation_token: spec.cancelation_token,
  nodes: JSON.parse(nodes),
});

// 3. Publish, so new runs use this version.
await client.journeys.publish(journey.id);
console.log(JSON.stringify({ journeyId: journey.id, templateIds }));

{
  "channel": "email",
  "notification": {
    "name": "Card expiring soon (email)",
    "tags": ["recipe", "expiring-card"],
    "brand": null,
    "subscription": null,
    "content": {
      "version": "2022-01-01",
      "elements": [
        {
          "type": "channel",
          "channel": "email",
          "elements": [
            {
              "type": "meta",
              "title": "Your card ending in {{card_last4}} expires soon"
            },
            {
              "type": "text",
              "content": "Hi {{default profile.first_name \"there\"}},"
            },
            {
              "type": "text",
              "content": "The {{card_brand}} card ending in {{card_last4}} expires on {{datetime-format expires_at \"MMMM d\" (default profile.timezone \"America/New_York\")}}. Update it now so your next {{plan_name}} payment goes through."
            },
            {
              "type": "action",
              "content": "Update card",
              "href": "https://app.acme.com/billing/card"
            },
            {
              "type": "text",
              "content": "It takes about a minute."
            }
          ]
        }
      ]
    }
  }
}

{
  "channel": "email",
  "notification": {
    "name": "Card expires in 7 days (email)",
    "tags": ["recipe", "expiring-card"],
    "brand": null,
    "subscription": null,
    "content": {
      "version": "2022-01-01",
      "elements": [
        {
          "type": "channel",
          "channel": "email",
          "elements": [
            {
              "type": "meta",
              "title": "Last reminder: your card expires on {{datetime-format expires_at \"MMMM d\" (default profile.timezone \"America/New_York\")}}"
            },
            {
              "type": "text",
              "content": "Hi {{default profile.first_name \"there\"}},"
            },
            {
              "type": "text",
              "content": "Your {{card_brand}} card ending in {{card_last4}} expires on {{datetime-format expires_at \"MMMM d\" (default profile.timezone \"America/New_York\")}}. Update it before then so your {{plan_name}} payment doesn't fail."
            },
            {
              "type": "action",
              "content": "Update card",
              "href": "https://app.acme.com/billing/card"
            }
          ]
        }
      ]
    }
  }
}

{
  "channel": "inbox",
  "notification": {
    "name": "Card expires in 7 days (Inbox)",
    "tags": ["recipe", "expiring-card"],
    "brand": null,
    "subscription": null,
    "content": {
      "version": "2022-01-01",
      "elements": [
        {
          "type": "channel",
          "channel": "inbox",
          "elements": [
            {
              "type": "meta",
              "title": "Your card expires on {{datetime-format expires_at \"MMMM d\" (default profile.timezone \"America/New_York\")}}"
            },
            {
              "type": "text",
              "content": "Update the card ending in {{card_last4}} so your next payment goes through."
            },
            {
              "type": "action",
              "content": "Update card",
              "href": "https://app.acme.com/billing/card"
            }
          ]
        }
      ]
    }
  }
}