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CargoBay is an Objective-C companion library that simplifies StoreKit-based in-app purchases on Apple platforms. It provides one-step receipt and transaction verification following Apple’s recommended server validation flow. Product information can be requested with block-based callbacks from local identifiers or identifiers supplied by a remote service. Payment queue observer methods are exposed as blocks, reducing the need for repetitive delegate code. The library automatically checks transaction uniqueness to help prevent the same purchase from being processed twice. ...