Knowledgebase

Working With the WHMCS API Print

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Automating a hosting business.

WHAT IT PROVIDES

Programmatic access to clients, orders, invoices, products, tickets and domains.

WHAT IT IS USED FOR

Provisioning from other systems Reporting Custom client interfaces Synchronising with other tools

WHAT AUTHENTICATION IT USES

Credentials issued to an administrative role, restricted by address.

WHAT TO RESTRICT

The permitted addresses The permitted actions

WHY

The credential can do a great deal, including financial actions.

WHAT TO NEVER DO

Expose the interface publicly without restriction Use an unrestricted administrative account

WHAT THE REQUEST SHAPE IS

An action name, with parameters.

WHAT TO CHECK IN EVERY RESPONSE

The result indicator, not only the status code.

WHY

Failures are reported in the body.

WHAT TO BE CAREFUL WITH

Actions that create invoices or take payment Bulk operations affecting many clients Assumptions about field names across versions

WHAT TO TEST AGAINST

A separate installation, never production.

WHY

Actions are frequently irreversible, and they affect real customers.

WHAT TO LOG

Every call and its outcome.

WHAT TO REVIEW AFTER ANY UPGRADE

Whether the actions you rely on changed.

WHAT TO PREFER FOR EXTENSIONS

A module using the internal interfaces, rather than external calls to your own system.


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