When you Sign up to Chat GPT for the First time, you get 5$ FREE CREDIT to use for your wave campaigns! 

Attention : You DO NOT need to be a monthly payee with Chat GPT to make this work.  You choose the Pay as you Go Method, where you just purchase credits to use as you use the tool. Just put some credit towards your Open Ai Account, from the links you see below. 

Get your API Keys by Visiting this >> https://platform.openai.com/api-keys