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Persistent identifiers (Pids) provide machine-actionable links to data and metadata that are vital to APIs (application programming interfaces) for publishing and citation. APIs are essentially request/response patterns that use Pids to reference things and metadata to describe not only the things themselves, but also any actions requested or taken. As a result, metadata design and standardization is wedded to API design and enhancement. With Pids as nouns and metadata as adjectives and qualifiers, Pid services play a key role in API implementation.