I'm going to be teaching an online course to minors using game-based learning strategies. I wasn't to make sure I consider ethics considering students (likely their parents) will be paying to take part in the course. They will have the choice to participate or not participate in the research and all other standard research protections such as anonymity in publishing, etc.
Is it ok that they are paying in versus being paid? Does the course to be free in order to be ethically appropriate?
Are there other ethical ideas I need to consider?
Thanks in advance!