apple-receipt-validation-response-decodable.swift

struct AppleReceiptValidationResponse: Decodable {
    let status: Int
    let environment: String
    struct Receipt: Decodable {
        let receipt_type: String
        let adam_id: Int
        let app_item_id: Int
        let bundle_id: String
        let application_version: String
        let download_id: Int
        let version_external_identifier: Int
        let receipt_creation_date_ms: Date
        let request_date_ms: Date
        let original_purchase_date_ms: Date
        let original_application_version: String
        struct InApp: Decodable {
            let quantity: String
            let product_id: String
            let transaction_id: String
            let original_transaction_id: String
            let purchase_date_ms: Date
            let original_purchase_date_ms: Date
            let expires_date_ms: Date
            let web_order_line_item_id: String
            let is_trial_period: String
            let is_in_intro_offer_period: String
        }
        let in_app: [InApp]
    }
    let receipt: Receipt
    struct LatestReceiptInfo: Decodable {
        let quantity: String
        let product_id: String
        let transaction_id: String
        let original_transaction_id: String
        let purchase_date_ms: Date
        let original_purchase_date_ms: Date
        let expires_date_ms: Date
        let web_order_line_item_id: String
        let is_trial_period: String
        let is_in_intro_offer_period: String
    }
    let latest_receipt_info: [LatestReceiptInfo]
    let latest_receipt: String
    struct PendingRenewalInfo: Decodable {
        let expiration_intent: String
        let auto_renew_product_id: String
        let original_transaction_id: String
        let is_in_billing_retry_period: String
        let product_id: String
        let auto_renew_status: String
    }
    let pending_renewal_info: [PendingRenewalInfo]
}

usage.swift

// the dates come back contained in Strings representing the milliseconds
// since the UNIX epoch so we need a custom date decoding strategy

let decoder = JSONDecoder()
decoder.dateDecodingStrategy = .custom { decoder in
    let container = try decoder.singleValueContainer()
    let dateString = try container.decode(String.self)
    guard let ms = TimeInterval(dateString) else {
        throw DecodingError.dataCorruptedError(in: container, debugDescription: "Expected String containing Int")
    }
    return Date(timeIntervalSince1970: ms / 1000)
}
print(try decoder.decode(AppleReceiptValidationResponse.self, from: $0.data))