Problem with snake case in Page Params

Hi, I'm using a API. It's response is to send a param to the url of a page in my app, the problem is that the param is in snake_case, but FlutterFlow doesn't allow to define a page paramers in snake_case, so how can I get that param?

For example, the api response is something like this:

myapp.com/myPage?pay_id=1234

I want to get "pay_id" param, but I can't as FlutterFlow just allow to define page parameters as "payId" for example, which would not work. What can I do?