You can collect customer payment information via the client SDK in a number of ways:

Client side payment token flow Diagram demonstrating the required interaction between the client, Braintree servers and your server.

iOS SDK setup

Drop-in requires a minimum deployment target of iOS 12+ and Xcode 12+.

For additional requirements and installation options, see the iOS Client SDK Guide.

Swift Package Manager

To add the BraintreeDropIn package to your Xcode project, select File > Swift Packages > Add Package Dependency and enter as the repository URL. Tick the checkbox for BraintreeDropIn.

If you look at your app target, you will see that the BraintreeDropIn library is automatically linked as a framework to your app (see General > Frameworks, Libraries, and Embedded Content).

Using CocoaPods

Add BraintreeDropIn to your Podfile:

pod 'BraintreeDropIn'

Then run pod install.

Get a client token

Client tokens are optional: You can initialize Braintree with a tokenization key instead of a client token. If you are using a tokenization key, you may skip this section and use the tokenization key for your authorization instead.

Your server is responsible for generating a client token, which contains the authorization and configuration details that your client needs to initialize the client SDK.

Your app should request a client token from your server. This example uses our sample integration server; please adapt it to use your own backend API.

func fetchClientToken() {
    // TODO: Switch this URL to your own authenticated API
    let clientTokenURL = NSURL(string: "")!
    let clientTokenRequest = NSMutableURLRequest(url: clientTokenURL as URL)
    clientTokenRequest.setValue("text/plain", forHTTPHeaderField: "Accept")

    URLSession.shared.dataTask(with: clientTokenRequest as URLRequest) { (data, response, error) -> Void in
        // TODO: Handle errors
        let clientToken = String(data: data!, encoding: String.Encoding.utf8)

        // As an example, you may wish to present Drop-in at this point.
        // Continue to the next section to learn more...

You should obtain a new client token frequently, at least once a day or as often as your app restarts. For the best experience, you should kick off this network operation before it would block a user interaction.

Try it now

We generated a demo tokenization key for you so you can jump right in. This is for testing purposes only! When you're ready to build your own integration, use your own tokenization key or generate your own client token.

let authorization = "sandbox_f252zhq7_hh4cpc39zq4rgjcg"

The above demo client token is for temporary use. You must change this client token in order to process payments with your Braintree sandbox or production account.

Present Drop-in UI

At this point, you are ready to collect payment information from your customer.

Drop-in is the easiest way to get started. It provides a fully fledged payments experience out of the box. You can also choose to create a custom UI and then tokenize the payment information directly.

Add the following import statement to any class using Braintree.

import BraintreeDropIn
func showDropIn(clientTokenOrTokenizationKey: String) {
    let request =  BTDropInRequest()
    let dropIn = BTDropInController(authorization: clientTokenOrTokenizationKey, request: request)
    { (controller, result, error) in
        if (error != nil) {
        } else if (result?.isCanceled == true) {
        } else if let result = result {
            // Use the BTDropInResult properties to update your UI
            // result.paymentMethodType
            // result.paymentMethod
            // result.paymentIcon
            // result.paymentDescription
        controller.dismiss(animated: true, completion: nil)
    self.present(dropIn!, animated: true, completion: nil)

Test your integration

Create a sandbox account

If you haven't already, sign up for a free Braintree sandbox account:

Sign Up for a Braintree Sandbox Account

Log in to obtain your sandbox API credentials. You'll need your:

  • Sandbox merchant ID
  • Public key
  • Private key

Use these credentials for your development and testing.


When you go live, you will need to replace your sandbox API credentials with production API credentials.

Test values

When testing in the sandbox, be sure to use our test card numbers (e.g. 4111111111111111) and nonces (e.g. fake-valid-nonce). Real payment method data will not work in the sandbox. See our Testing page for more details.

Send payment method nonce to server

Send the resulting payment method nonce to your server (again, adapt this example to your own setup):

func postNonceToServer(paymentMethodNonce: String) {
    // Update URL with your server
    let paymentURL = URL(string: "")!
    var request = URLRequest(url: paymentURL)
    request.httpBody = "payment_method_nonce=\(paymentMethodNonce)".data(using: String.Encoding.utf8)
    request.httpMethod = "POST"

    URLSession.shared.dataTask(with: request) { (data, response, error) -> Void in
        // TODO: Handle success or failure

world.greeted = true

At this point, you should have a working client-side checkout flow. When your user provides payment information, you receive a payment method nonce and send it to your server.

Next, your server closes the loop by using the payment method nonce to create a transaction.

Next Page: Simple Server →