I need a complete ABP sketch example to test my Heltec WiFi Lora32(v2) to connect to ATC

Hi
I am trying to send messages to American Tower in Brazil (915MHz)(I have a contract and active devices) but I am not well succed using the library exemples.
So, I need a complete ABP sketch example (radio type, config.h, etc…) to test my Heltec WiFi Lora32(v2) to connect to ATC.
Can anybody help me sending a complete and all ready sketch for me to do it?

Thanks in advance.