Braintree CodenameOne

Integrates the Braintree SDK's for iOS/Android. There is also a somewhat broken fallback implementation based on the JavaScript API. This SDK assumes you integrated braintree in the server and have a server side API to facilitate the payment processing.

Check out the Braintree's docs to understand how this integrates with the server side which does most of the heavy lifting within this API.

The API for Braintree on the client includes one method: Purchase.startOrder() where a callback interface is passed to provide:

Purchase.startOrder(new Purchase.Callback() {
        public String fetchToken() {
           // this method needs to return the token from the Brain tree server API. 
           // You need to use this code to connect to your server or return the data
           // from a previous connection that fetched the token
        }
        
        public void onPurchaseSuccess(String nonce) {
            // this is a callback that will be invoked when the purchase succeeds
        }
        
        public void onPurchaseFail(String errorMessage) {
            // this is a callback that will be invoked when the purchase fails
        }
        
        public void onPurchaseCancel() {
            // this is a callback that will be invoked when the purchase is canceled
        }
    });