invoice;
        $contact = $invitation->contact;
        $passwordHTML = isset($data['password']) ? '
'.trans('texts.password').': '.$data['password'].'
' : false;
        $documentsHTML = '';
        if ($account->hasFeature(FEATURE_DOCUMENTS) && $invoice->hasDocuments()) {
            $documentsHTML .= trans('texts.email_documents_header').'
';
        }
        $variables = [
            '$footer' => $account->getEmailFooter(),
            '$emailSignature' => $account->getEmailFooter(),
            '$client' => $client->getDisplayName(),
            '$idNumber' => $client->id_number,
            '$vatNumber' => $client->vat_number,
            '$account' => $account->getDisplayName(),
            '$dueDate' => $account->formatDate($invoice->partial_due_date ?: $invoice->due_date),
            '$invoiceDate' => $account->formatDate($invoice->invoice_date),
            '$contact' => $contact->getDisplayName(),
            '$firstName' => $contact->first_name,
            '$amount' => $account->formatMoney($data['amount'], $client),
            '$total' => $invoice->present()->amount,
            '$balance' => $invoice->present()->balance,
            '$invoice' => $invoice->invoice_number,
            '$quote' => $invoice->invoice_number,
            '$number' => $invoice->invoice_number,
            '$partial' => $invoice->present()->partial,
            '$link' => $invitation->getLink(),
            '$password' => $passwordHTML,
            '$viewLink' => $invitation->getLink().'$password',
            '$viewButton' => Form::emailViewButton($invitation->getLink(), $invoice->getEntityType()).'$password',
            '$paymentLink' => $invitation->getLink('payment').'$password',
            '$paymentButton' => Form::emailPaymentButton($invitation->getLink('payment')).'$password',
            '$customClient1' => $client->custom_value1,
            '$customClient2' => $client->custom_value2,
            '$customContact1' => $contact->custom_value1,
            '$customContact2' => $contact->custom_value2,
            '$customInvoice1' => $invoice->custom_text_value1,
            '$customInvoice2' => $invoice->custom_text_value2,
            '$documents' => $documentsHTML,
            '$autoBill' => empty($data['autobill']) ? '' : $data['autobill'],
            '$portalLink' => $invitation->contact->link,
            '$portalButton' => Form::emailViewButton($invitation->contact->link, 'portal'),
        ];
        // Add variables for available payment types
        foreach (Gateway::$gatewayTypes as $type) {
            if ($type == GATEWAY_TYPE_TOKEN) {
                continue;
            }
            $camelType = Utils::toCamelCase(GatewayType::getAliasFromId($type));
            $snakeCase = Utils::toSnakeCase(GatewayType::getAliasFromId($type));
            $variables["\${$camelType}Link"] = $invitation->getLink('payment') . "/{$snakeCase}";
            $variables["\${$camelType}Button"] = Form::emailPaymentButton($invitation->getLink('payment')  . "/{$snakeCase}");
        }
        $includesPasswordPlaceholder = strpos($template, '$password') !== false;
        $str = str_replace(array_keys($variables), array_values($variables), $template);
        if (! $includesPasswordPlaceholder && $passwordHTML) {
            $pos = strrpos($str, '$password');
            if ($pos !== false) {
                $str = substr_replace($str, $passwordHTML, $pos, 9/* length of "$password" */);
            }
        }
        $str = str_replace('$password', '', $str);
        $str = autolink($str, 100);
        return $str;
    }
}