Stripe confirm Card details for swift

Question

I using CardIO and stripe for quick payment set for an app. I'm going through stripes documentation to find out how to validate quickly without setting up a full account.

My first question is what does textField.isValid confirm? Is there some call to stripe to confirm the card or is a simple content check?

func paymentCardTextFieldDidChange(_ textField: STPPaymentCardTextField) {
    // Toggle buy button state
    buyButton.enabled = textField.isValid
}

Second if it does confirm that the card is valid was is the difference between this and the code below? Is the token only to used when a purchase is about to be executed?

func userDidProvideCreditCardInfo(cardInfo: CardIOCreditCardInfo!, inPaymentViewController paymentViewController: CardIOPaymentViewController!) {
        if let info = cardInfo {
            let str = NSString(format: "Received card info.\n Number: %@\n expiry: %02lu/%lu\n cvv: %@.", info.redactedCardNumber, info.expiryMonth, info.expiryYear, info.cvv)
            print(str)

            //dismiss scanning controller
            paymentViewController?.dismissViewControllerAnimated(true, completion: nil)

            //create Stripe card
            let card: STPCardParams = STPCardParams()
            card.number = info.cardNumber
            card.expMonth = info.expiryMonth
            card.expYear = info.expiryYear
            card.cvc = info.cvv

            //Send to Stripe
            getStripeToken(card)

        }
    }

Edit: I should add that I'm curious if I have to begin processing a payment to confirm a card or can I do that beforehand? (example: the exp date you entered is incorrect).

Answer 1

textField.isValid in that case validates that each of the STPPaymentCardTextField fields are valid ; that doesn't involve any API calls to Stripe.

The second example does make a 'create Token' API call to Stripe, though that also doesn't actually validate the Card; it's not until you use it to create a Customer or store it on an existing Customer , or to create a Charge , that it gets validated.