====== API Design ======

Traffic Elf uses simple PHP-based JSON APIs.

===== Design Goals =====

  * Simple endpoints
  * Readable JSON
  * No framework dependency (initially)

-----

===== Example: Clients API =====

Endpoint:
  /api/clients.php

<code php>
<?php
require 'db.php';

$stmt = $pdo->query("SELECT * FROM clients ORDER BY name");
echo json_encode($stmt->fetchAll());
</code>

-----

===== Example: Campaigns API =====

Endpoint:
  /api/campaigns.php

<code php>
<?php
require 'db.php';

$stmt = $pdo->query("SELECT * FROM campaigns ORDER BY start_date DESC");
echo json_encode($stmt->fetchAll());
</code>

-----

===== Frontend Usage =====

<code javascript>
fetch('/api/clients.php')
  .then(res => res.json())
  .then(data => renderGrid(data));
</code>