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Email Integration Guide (Supabase + Resend)

This guide explains how to send emails to logged-in users using Supabase Edge Functions and Resend.

Prerequisites

  1. Supabase Project: You already have this.
  2. Resend Account: Sign up at resend.com (Free tier allows 3000 emails/mo).
  3. Supabase CLI: You need this installed on your machine to deploy functions.

Step 1: Install Supabase CLI

If you haven't already:

brew install supabase/tap/supabase

Step 2: Login to Supabase CLI

supabase login

Follow the browser instructions to log in.

Step 3: Initialize Supabase (Locally)

Inside your project root (brAIn folder):

supabase init

Step 4: Configure Secrets

You need to give your Supabase function access to your Resend API Key.

  1. Get your API Key from Resend Dashboard.
  2. Run this command (replace YOUR_RESEND_KEY):
supabase secrets set RESEND_API_KEY=re_123456789

Step 5: Deploy the Function

I have created the function code for you in supabase/functions/send-email/index.ts. To deploy it to the cloud:

supabase functions deploy send-email

Step 6: Usage

Option A: Call from Frontend (React)

You can trigger this function directly from your app (e.g., when a user clicks a button).

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

const sendWelcomeEmail = async () => {
  const { data, error } = await supabase.functions.invoke('send-email', {
    body: {
      subject: 'Welcome to brAIn!',
      html: '<h1>Welcome Cadet!</h1><p>Ready to learn?</p>'
    },
  });

  if (error) console.error('Error:', error);
  else console.log('Email sent:', data);
};

Option B: Call from Database (Trigger)

You can set up a Database Webhook in the Supabase Dashboard to automatically call this function whenever a new user is created in the auth.users table.