Just install Paddle Gateway for an inline checkout experience. This gateway handles everything behind the scenes to maximize payment performance and operate with full integrity.

Features:

• Payment Gateway
• Onetime Payments
• Subscriptions
• Link your Paddle Plans with WHMCS Products
• Include VAT/GST
• Sandbox Mode
• Webhook Support
• Apple Pay
• Optimized for Latest WHMCS
• Available for PHP 8.1
• Lifetime Updates
• Lifetime Support
• Install & Setup*

Paddle Website :https://vendors.paddle.com/

Paddle Sandbox Login: https://sandbox-vendors.paddle.com/

Paddle API Docs: https://developer.paddle.com/api-reference/intro

Contact Support to give it a try before buy