StoreKit iOS 12.2 Beta 2 to Beta 3 API Differences

Added SKErrorInvalidOfferIdentifier

Added SKErrorInvalidSignature

Added SKErrorMissingOfferParams

Added SKErrorInvalidOfferPrice

Added SKPayment.paymentDiscount

Added SKMutablePayment.paymentDiscount

Added SKPaymentDiscount

Added -[SKPaymentDiscount initWithIdentifier:keyIdentifier:nonce:signature:timestamp:]

Added SKPaymentDiscount.identifier

Added SKPaymentDiscount.keyIdentifier

Added SKPaymentDiscount.nonce

Added SKPaymentDiscount.signature

Added SKPaymentDiscount.timestamp

Added SKProduct.discounts

Added SKProductDiscountType

Added SKProductDiscountTypeIntroductory

Added SKProductDiscountTypeSubscription

Added SKProductDiscount.identifier

Added SKProductDiscount.type