function salut_paypal_access_token() {
  $client_id = trim((string) salut_paypal_client_id());
  $secret    = trim((string) salut_paypal_secret());

  if (!$client_id || !$secret) {
    return new WP_Error(
      'paypal_no_credentials',
      'PayPal credentials missing.',
      ['status' => 500]
    );
  }

  $resp = wp_remote_post(
    salut_paypal_api_base() . '/v1/oauth2/token',
    [
      'timeout' => 30,
      'headers' => [
        'Authorization' => 'Basic ' . base64_encode($client_id . ':' . $secret),
        'Accept'        => 'application/json',
      ],
      'body' => [
        'grant_type' => 'client_credentials',
      ],
    ]
  );

  if (is_wp_error($resp)) {
    return $resp;
  }

  $code = wp_remote_retrieve_response_code($resp);
  $raw  = wp_remote_retrieve_body($resp);

  $data = json_decode($raw, true);

  if ($code < 200 || $code >= 300 || empty($data['access_token'])) {

    $paypal_error = $raw;

    if (is_array($data)) {
      $paypal_error = json_encode($data);
    }

    return new WP_Error(
      'paypal_token_error',
      'Could not get PayPal access token. HTTP ' . $code . ' Response: ' . $paypal_error,
      [
        'status' => 500,
        'paypal' => $paypal_error,
      ]
    );
  }

  return $data['access_token'];
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