Supabase

Call SendFS from a Supabase Edge Function when a row is inserted. The service role stays on Supabase. The SendFS key stays in the function secret.

In the Supabase dashboard, set SENDFS_API_KEY and SENDFS_FROM. Deploy the function below and invoke it from a database webhook on auth.users or your own profiles table.

import "jsr:@supabase/functions-js/edge-runtime.d.ts";

Deno.serve(async (req) => {
  const payload = await req.json();
  const email = payload.record?.email;
  if (!email) return new Response("missing email", { status: 400 });

  const response = await fetch(Deno.env.get("SENDFS_URL") + "/api/emails", {
    method: "POST",
    headers: {
      Authorization: `Bearer ${Deno.env.get("SENDFS_API_KEY")}`,
      "Content-Type": "application/json"
    },
    body: JSON.stringify({
      from: Deno.env.get("SENDFS_FROM"),
      to: [email],
      template: "welcome",
      variables: { email }
    })
  });

  return new Response(await response.text(), { status: response.status });
});