Amazon Seller Central is an online platform where businesses can sell their products to millions of Amazon customers worldwide. On the other hand, WHMCS is a comprehensive customer management and billing solution for web hosting companies and online businesses.

Integrating Amazon Seller Central and WHMCS through API or SDK provides numerous benefits to online businesses. One of the main advantages of this integration is streamlining the order fulfillment process. With the integration, orders placed on Amazon are automatically transferred to WHMCS, reducing the need for manual data entry.

The integration also allows for real-time inventory management, ensuring that businesses can accurately track their product stocks across different channels. The integration also enables automatic shipment tracking, which means that business owners can send shipping updates to their customers automatically and keep them informed throughout the shipping process.

Furthermore, integration through AWS SDK allows businesses to retrieve order data and track customer data. Amazon provides various SDKs which can be integrated with WHMCS, making it easy to manage customer orders and data in real-time. The integration also provides support for multiple sales channels, enabling businesses to sell on Amazon while keeping their existing customer base in WHMCS.