Last Updated: 23 August 2024 | Change Log

Create a session to pay with a card

Use our iOS SDK to secure your customer's card details within the UI components by creating a session.

Full Sample Integration

You can see an example of the session generation here.

Reference your UI components

To display your checkout form, you must create your layout first using your storyboard.

As part of our SDK, we provide a UI Component dedicated to capturing your customer's card details to minimize your exposure to PCI Data.

You must use this component if you want to qualify for the lowest level of PCI compliance (SAQ-A).

Here's an example of how you would reference your a UI component using unique identifiers

import AccessCheckoutSDK

class ViewController: UIViewController {

    @IBOutlet weak var panAccessCheckoutView: AccessCheckoutUITextField!
    @IBOutlet weak var expiryDateAccessCheckoutView: AccessCheckoutUITextField!
    @IBOutlet weak var cvcAccessCheckoutView: AccessCheckoutUITextField!

    func submitButtonClickHandler() {
        // code to generate your session
        ...
    }   
    ...

Validate card details

You can optionally validate your customer's card details. You can find instructions here

Create a session

Initialize the AccessCheckoutClient

You must now initialize the SDK using the AccessCheckoutClientBuilder.

To do this, you must provide your BaseURL, checkoutId and other parameters. See the table below for more information.

Here's an example of how you would initialize the SDK with the mandatory parameters.

// The AccessCheckoutClientBuilder throws an error if either the accessBaseUrl() or checkoutId() calls are omitted 
let accessCheckoutClient:AccessCheckoutClient? = try? AccessCheckoutClientBuilder().accessBaseUrl(<ACCESS_BASE_URL>)
   .checkoutId(<CHECKOUT_ID>)
   .build()

Placeholder	Descriptions
`<ACCESS_BASE_URL>`	For testing use: `https://try.access.worldpay.com/` For live use: `https://access.worldpay.com/`
`<CHECKOUT_ID>`	Your unique checkout ID as provided by Worldpay.

Retrieve the session

Submitting your customer's card details

The SDK extracts your customers card details from the UI Component, the card details are then submitted to retrieve a session.

// The CardDetailsBuilder throws an error if the expiry date is provided in a format different from MM/YY or MMYY (which will not happen if you use the components with built-in validation provided by the SDK)
let cardDetails:CardDetails = try! CardDetailsBuilder().pan(panAccessCheckoutView)
    .expiryDate(expiryDateAccessCheckoutView)
    .cvc(cvcAccessCheckoutView)
    .build()

Specifying the session

You must specify [SessionType.card] as the type of session to generate.

try? accessCheckoutClient?.generateSessions(cardDetails: cardDetails, sessionTypes: [SessionType.card]) { result in
    DispatchQueue.main.async {
        switch result {
        case .success(let sessions):
            // The session is returned in a Dictionary[SessionType:String]
            let session = sessions[SessionType.card]
            ...
        case .failure(let error):
            // The error returned is of type AccessCheckoutError 
            let errorMessage = error.message
            ...
        }
    }
}

Note

The call to generateSessions takes a closure that returns a Result<[SessionType: String], AccessCheckoutError>
You must use the pattern of the main thread in the closure when handling the success/failure would lead to updating the UI

Full code sample

Here's the full code sample of the steps above.

import AccessCheckoutSDK

class MyViewController: UIViewController {
    private let accessBaseUrl = "https://try.access.worldpay.com"
    private let checkoutId = "your-checkout-id"
    @IBOutlet weak var panAccessCheckoutView: AccessCheckoutUITextField!
    @IBOutlet weak var expiryDateAccessCheckoutView: AccessCheckoutUITextField!
    @IBOutlet weak var cvcAccessCheckoutView: AccessCheckoutUITextField!
    @IBAction func submit(_ sender: Any) {
        let cardDetails = try! CardDetailsBuilder().pan(panAccessCheckoutView)
            .expiryDate(expiryDateAccessCheckoutView)
            .cvc(cvcAccessCheckoutView)
            .build()
        let accessCheckoutClient = try? AccessCheckoutClientBuilder().accessBaseUrl(accessBaseUrl)
            .checkoutId(checkoutId)
            .build()
        try? accessCheckoutClient?.generateSessions(cardDetails: cardDetails, sessionTypes: [SessionType.card]) { result in
            DispatchQueue.main.async {
                switch result {
                    case .success(let sessionsDictionary):
                        let session = sessionsDictionary[SessionType.card]
                        ...
                    case .failure(let error):
                        ...
                }
            }
        }
    }
}

Caution

Do not validate the structure or length of the session resources. We follow HATEOS standard to allow us the flexibility to extend our APIs with non-breaking changes.

Important

The CARD session has a lifespan of one minute and you can use it only once. If you do not create a token within that time, you must create a new CARD session value.