Know what can be migrated or adapted and what cannot.

Migration

The migrator imports supported records without modifying source WHMCS tables. Use staging, backups and preferably read-only source credentials.

Modules

KBilling uses its own runners. Addons have partial procedural parity; server, gateway and registrar modules use KBilling class contracts.

ModuleExpectationOpen-source PHPUsually portable with review and adaptation.IonCube encodedCannot be inspected or safely adapted without vendor support.WHMCS\Database\CapsuleRewrite using KB_DB or a deliberate adapter.localAPI()Replace with KBilling services or restricted API calls.Payment modulesRequire full callback/security review.