Help with ESP32 Code and Waves

I read this article: Blockchain + IoT = ❤️. Blockchain is a great technology, which… | by Inal Kardanov | Coinmonks | Medium
First a BIG BIG THANK YOU to Inal Kardanov and to Sergey Tolmachev for writing the article.

Since I am a Beginner learning arduino I need more simple code to understand better how it works.

I would like to turn ON the ESP32 built-in LED for 3 seconds when it detects a payment of >0.07 WAVES was made to a specific Waves address. That is all.

Can someone post the Arduino Code? It would be much appreciated.