PayPal provides a very simple REST API to enable us selling digital products in our website or apps. For example, I integrate it within my website to sell programming tutorials, source code, etc. In this post, I will explain how PayPal REST api works and demonstrate PayPal checkout workflow step by step.
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As Paypal already released their new REST APIs for several month and they marked their old approach NVP and SOAP API as LEGACY way to invoke PayPal payment gateway, it’s necessary to update my PayPal Digital Goods tools by PayPal Rest API.
Read morePayPal NVP/SOAT API was introduced several years ago. It enables people selling products in their own weibsite. Basing on this set of APIs, I also developed a tool, Digital Goods Express Checkout, with it, you can very simple integrate “Buy Button” in your website. No matter your website is created by WordPress, or Joomla, or just a plain HTML.
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Currently Google has officially launched an Android Jetpack Compose developer course, in which we can study how to use Jetpack Compose to build an Android app in the right way. Additionaly, after finishing the developer course, we can join a short test and there is an oppotunity to get a cute Android toy if we pass the test.
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In a modern iPhone app, a smooth user experience is quite important. To achieve this, caching the internet resources to local is a good approach. Therefore, to make the app more smoothly when users open it, downloading images and videos and saving them locally will quite improve the app starting speed. In the last tutorial, I have demonstrated how to download files by Swift 5 and watch the download status such as progress. The downloading task is controlled by 3 buttons: a start button to start, a pause button to pause and resume, a stop button to stop. In this tutorial, I will show how to save the downloaded file in local and open it by default in the iPhone. The whole tutorial is developed under the latest Swift.
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