Use caseYour new users get their welcome on WhatsApp, and take action.

Step by step, for real.

1. 1

   The welcome template

   Claude Code creates it with create_template, in the marketing category: for Meta, a welcome that invites people to use the product is marketing. The first name, and a button to the page that gets the user started; get_template_status confirms the approval.

2. 2

   The form’s box

   The sign-up form carries a “Get my getting-started tips on WhatsApp” box, unticked by default. Without it, nothing goes out: a marketing template only goes to those who consented.

3. 3

   The send at sign-up

   Once the account exists, your app sends the template with POST /v1/sends, with the consent and its source: the API writes them on the contact before the marketing filter. An idempotency key taken from the user prevents duplicates.

4. 4

   The first use

   The user taps the message’s button: your app opens on the page of their first action, their first schedule, their first project.

What you type in Claude Code

With the plugin installed, one sentence is enough. The film’s also wires the failed payment recovery: Claude Code creates both templates, writes the code and tests.

/messagingme:demarrer at sign-up (app/signup.ts), a whatsapp welcome with the link to create their first schedule. and when stripe reports a failed payment, a whatsapp with the link to update their card

The welcome, as Claude Code writes it

import { messagingme } from '../lib/messagingme';

// Call it once the account exists. The template welcome is MARKETING (it invites to use the product): it only
// goes to someone who ticked the WhatsApp box on the sign-up form. It has one variable, the first name, and a URL
// button to the page that creates the first schedule.
export async function sendWelcome(user: { id: string; phone: string; firstName: string; whatsappOptIn: boolean }): Promise<void> {
  if (!user.whatsappOptIn) return;
  const send = await messagingme.POST('/v1/sends', {
    body: {
      target: { template: { name: 'welcome', language: 'en' } },
      recipients: [{
        phone: user.phone,
        variables: { firstName: user.firstName },
        // The ticked box is the consent: written on the contact before the marketing filter.
        consent: 'opted_in',
        consentSource: 'signup form',
      }],
      params: [{ position: 1, source: { type: 'variable', key: 'firstName' } }],
    },
    // Replayed within 24 hours (the life of the key), the welcome does not send twice.
    idempotencyKey: `welcome-${user.id}`,
  });
  // A refused recipient (STOP, no consent, plan limit) is not an error: it is listed in skipped, with its reason.
  if (send.skippedTotal > 0) console.warn(`welcome ${user.id} not sent: ${send.skipped[0]?.reason}`);
}

app/signup.ts · all the code in the guide