do {
  let receipt = try InAppReceipt.localReceipt() 
  
  //let receiptData: Data = ...
  //let receipt = try InAppReceipt.receipt(from: receiptData)
} catch {
  print(error)
}

// Retrieve Original TransactionIdentifier for Product Name
receipt.originalTransactionIdentifier(ofProductIdentifier: subscriptionName)

// Retrieve Active Auto Renewable Subscription's Purchases for Product Name and Specific Date
receipt.activeAutoRenewableSubscriptionPurchases(ofProductIdentifier: subscriptionName, forDate: Date())

// Retrieve All Purchases for Product Name
receipt.purchases(ofProductIdentifier: subscriptionName)

do {
    try r.verifyHash()
} catch ReceiptValidatorError.hashValidationFaied {
    // Do smth
} catch {
    // Do smth
}