How multiple transactions in a row for one user are treated

I'm trying to start multiple auto renewable purchase of subscriptions in once for one user, I'm curious how it is handled by Apple I append transactions like this:

func startTransactions(purchaseIDs: Array<String>) {
        if (SKPaymentQueue.canMakePayments()) {
            
            purchaseIDs.forEach { id in
                let transactionRequest = SKMutablePayment()
                transactionRequest.productIdentifier = id
                SKPaymentQueue.default().add(transactionRequest)
            }
            
        } 
 }

and I have this method

func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        for transaction in transactions {
        }
}

What i want to know if multiple SKPaymentQueue.default().add(transactionRequest) in a row results in one transaction of does it results in multiple transactions (one per product)

Thanks in advance for your help