Setup the Pico-ESP8266 Wifi expansion module with Raspberry Pico for sending the POST request to REST API.
Pico-ESP8266 demo codes are heavily used. Use as a reference
Use as shield mode or like in the picture.
Look for documentation for correct pinout. https://www.waveshare.com/wiki/Pico-ESP8266
PicoSDK is used to build the project.