ios - iOS Swift 中的 Braintree 插件 : Where to get variable PaymentMethodNonce:

Question

我一直在按照此处的说明操作 https://developers.braintreepayments.com/start/hello-client/ios/v4在 iOS Swift 中将直接支付表单与 braintree 集成。我的代码如下所示，据我所知，它与文档完全匹配。

func fetchClientToken() {
    // TODO: Switch this URL to your own authenticated API
    let clientTokenURL = NSURL(string: "https://braintree-sample-merchant.herokuapp.com/client_token")!
    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.
        self.showDropIn(clientTokenOrTokenizationKey: clientToken!)

        // Continue to the next section to learn more...
        }.resume()
}

func postNonceToServer(paymentMethodNonce: String) {
    // Update URL with your server
    let paymentURL = URL(string: "https://your-server.example.com/payment-methods")!
    let request = NSMutableURLRequest(url: paymentURL)
    request.httpBody = "payment_method_nonce=\(paymentMethodNonce)".data(using: String.Encoding.utf8)
    request.httpMethod = "POST"
    URLSession.shared.dataTask(with: request as URLRequest) { (data, response, error) -> Void in
        // TODO: Handle success or failure
        }.resume()
}

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

现在，我可以调用 fetchClientToken 函数，如您所见，它又调用 showDropIn，一切正常。

但是，要将 postNonceToServer 作为下一个函数运行，我需要一个变量 paymentMethodNonce 并且我不知道从哪里获取，我认为文档中遗漏了这一点。因此，我无法在运行 showDropIn 后继续......

我很困惑，我确信有一个简单的修复方法，但我找不到关于这一点的任何文档。

Answer 1

函数 showDropIn 中的 result.paymentMethod.nonce 包含所需信息。

func showDropIn(clientTokenOrTokenizationKey: String) {
    let request =  BTDropInRequest()
    let dropIn = BTDropInController(authorization: clientTokenOrTokenizationKey, request: request)
    { (controller, result, error) in
        if (error != nil) {
            print("ERROR")
        } else if (result?.isCancelled == true) {
            print("CANCELLED")
        } else if let result = result {

            let out = result.paymentMethod!
            print(out.nonce)
            self.postNonceToServer(paymentMethodNonce: out.nonce)

            // Use the BTDropInResult properties to update your UI
            // result.paymentOptionType
            // result.paymentMethod
            // result.paymentIcon
            // result.paymentDescription
        }
        controller.dismiss(animated: true, completion: nil)
    }
    self.present(dropIn!, animated: true, completion: nil)
}