client.enable_fast_withdraw_switch() ERROR...! ERROR...!



I want to use this code, but I keep getting code errors.
Please refer to the attached image
How can I solve this problem?
Help me.

The key code is not present in json_res. Print json_res out and see what it contains to start your debugging process.

Thank you for your answer. But can you explain it a little easier? Thank you for taking time out of my question.

I would appreciate it if you could show me an example of a code with this code applied.
Or do you know any sites where you can find code examples like this?