adyen-node-api-library VS sampleapis

The first step is to install the Adyen API library, these examples will be in TypeScript so we’re going to use the Node.js library. These examples are built using version 15.1.0 of the api-library which utilizes the latest version of Checkout API (71).

Next, we need to iterate over the list of notification request items, and process them based on the type of event the notification item is associated with (i.e., its eventCode). As we iterate through the list, however, we’ll also want to verify its HMAC (hash-based message authentication code) signatures. This helps protect the application server from unauthorised notifications, such as any data that may have been modified during transmission. Since our application leverages the Adyen Node.js server-side library to interact with Adyen’s API, we can conveniently import and instantiate the built-in HMAC validator class to do just that:

So I'm new to APIs in general, and for starters I tried pulling some sample APIs from this link. So I know the very bare basics as laid out on this resource