Types of APIs

APIs are generally classified into the following types:

Term	Explanation
Public API	Built for external access. 'Open' does not always mean free; security is crucial.
Partner API	Intended for partners, often optimised for their processes. Security is essential.
Internal APIs	Restricted to internal networks, primarily involving one provider and one consumer. Often used for legacy systems and internal communications.

WPP-specific API types are yet to be defined.

This document applies to all API types, but guidelines may vary per type. The guidelines are documented in the following way:

(A) API type applicability: Internal, Private, Partner, and Public APIs. Internal API standards in this document apply to APIs on the same platform as the initiating API but can extend to others.

(B) Design Authority enforcement:

• Must: Compliance is mandatory; non-compliant deployments to acceptance are blocked.
• Should: Compliance is expected, but temporary deviations may be allowed with justification and a compliance plan.
• Could: Optional but recommended criteria, allowing deployment even if not met.