Am I paying for unresolved captchas?

#2
I am using https://2captcha.com/software/2catpchaapi. How are unresolved captchas and cases when the API returns an error charged?
Our API has a method for reporting incorrectly resolved captchas. The answers are then checked by moderators and then funds are returned to your account if the answers were incorrect. In addition, most software automatically sends such messages.

This is already integrated into 2CaptchaAPI, you do not need to pay for unsolved captchas.