Sending WHMCS Invoices via WhatsApp Automatically

<?php
// File: includes/hooks/whatsapp_invoice.php

use WHMCS\Database\Capsule;

add_hook('InvoiceCreated', 1, function($vars) {
    $invoiceId = $vars['invoiceid'];
    
    // Get invoice details
    $invoice = localAPI('GetInvoice', {
        'invoiceid' => $invoiceId
    });
    
    // Get client details
    $client = localAPI('GetClientsDetails', {
        'clientid' => $invoice['userid']
    });
    
    // Format phone number (ensure country code)
    $phone = formatPhoneNumber($client['phonenumber']);
    
    if (!empty($phone)) {
        // Create WhatsApp message
        $message = createInvoiceMessage($invoice, $client);
        
        // Send WhatsApp message
        sendWhatsAppMessage($phone, $message);
        
        // Log the action
        logActivity("WhatsApp invoice sent to $phone for Invoice #$invoiceId");
    }
});

function createInvoiceMessage($invoice, $client) {
    $companyName = \WHMCS\Config\Setting::getValue('CompanyName');
    $currencyCode = $invoice['currencycode'];
    
    $message = "🧾 *Invoice from $companyName*\n\n";
    $message .= "Hi " . $client['firstname'] . ",\n\n";
    $message .= "Your invoice #" . $invoice['invoicenum'] . " is ready!\n";
    $message .= " Amount: " . $currencyCode . " " . $invoice['total'] . "\n";
    $message .= "📅 Due Date: " . $invoice['duedate'] . "\n\n";
    $message .= " *Pay Now:* " . $invoice['paymentlink'] . "\n\n";
    $message .= "Need help? Reply to this message or contact support.\n";
    $message .= "\nThank you! 🙏";
    
    return $message;
}

function formatPhoneNumber($phone) {
    // Remove all non-numeric characters
    $phone = preg_replace('/[^0-9]/', '', $phone);
    
    // Add country code if missing (example: +1 for US)
    if (strlen($phone) == 10) {
        $phone = '1' . $phone; // US/Canada
    }
    
    return $phone;
}

function sendWhatsAppMessage($phone, $message) {
    $apiUrl = 'https://api.whatsapp.com/send-message'; // Replace with your API
    $accessToken = 'your_whatsapp_access_token';
    
    $data = {
        'messaging_product' => 'whatsapp',
        'recipient_type' => 'individual',
        'to' => $phone,
        'type' => 'text',
        'text' => {
            'body' => $message
        }
    };
    
    $headers = {
        'Authorization: Bearer ' . $accessToken,
        'Content-Type: application/json'
    };
    
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $apiUrl);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    
    $response = curl_exec($ch);
    curl_close($ch);
    
    return json_decode($response, true);
}
?>

// Only send WhatsApp for invoices above certain amount
add_hook('InvoiceCreated', 1, function($vars) {
    $invoice = localAPI('GetInvoice', {'invoiceid' => $vars['invoiceid']});
    
    // Only send for invoices > $50
    if ($invoice['total'] > 50) {
        // Send WhatsApp
        sendInvoiceWhatsApp($invoice);
    }
    
    // Or check client preference
    $client = localAPI('GetClientsDetails', {'clientid' => $invoice['userid']});
    if (isset($client['customfields']['WhatsApp Notifications']) && 
        $client['customfields']['WhatsApp Notifications'] == 'Yes') {
        sendInvoiceWhatsApp($invoice);
    }
});

function getLocalizedMessage($template, $language, $variables) {
    $messages = {
        'en' => "Hi {name}, your invoice #{invoice} for ${amount} is ready. Pay: {link}",
        'es' => "Hola {name}, tu factura #{invoice} por ${amount} está lista. Pagar: {link}",
        'fr' => "Salut {name}, votre facture #{invoice} de ${amount} est prête. Payer: {link}"
    };
    
    $message = $messages[$language] ?? $messages['en'];
    
    foreach ($variables as $key => $value) {
        $message = str_replace('{' . $key . '}', $value, $message);
    }
    
    return $message;
}