How to Integrate Billing with WHMCS

WHMCS is the most widely used billing platform for hosting resellers and digital service businesses. Integrating WHMCS with a white-label reseller platform automates customer signup, billing, provisioning, and account suspension — eliminating most manual operations.

Step 1: Install WHMCS on your server

WHMCS is licensed software running on your own hosting. Install via cPanel auto-installer or follow the official installation guide.

Step 2: Get reseller platform API credentials

Your white-label platform should provide REST API credentials (API key, secret) in the reseller dashboard. Generate these and copy to a secure location.

Step 3: Install or build a WHMCS provisioning module

WHMCS modules connect to external APIs. Either use an official module from your reseller platform or build a custom one using the WHMCS module SDK.

Step 4: Configure product mappings

Map each WHMCS product to a reseller platform product. When a customer buys, WHMCS calls the API to provision the matching product.

Step 5: Set up automated billing rules

Configure invoicing, payment gateway, dunning, and suspension rules. WHMCS handles the customer-facing billing flow.

Step 6: Test the full signup-to-suspension lifecycle

Run a test purchase, verify provisioning, manually suspend, and verify the customer loses access. Fix any gaps before going live.