The PSPDFKit API provides an HTTP-based API for integrating with an existing backend, allowing to add documents by uploading them, copy a previously added document, usually with the intention to share it with a different set of users, delete documents, and fetch, create, update, and delete annotations in a particular document.
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The PSPDFKit iOS SDK interacts with the API to access PDF features. The quick start guide includes integrating PSPDFKit — manually, using CocoaPods, or using Carthage, adding the license key, example projects, and API reference.