AGB for paid subscriptions

[Rabby]

Hey,
does anybody know how to show my AGB/General Terms and Conditions before purchasing a paid subscription?
Like you choose a paid subscription -> press purchase -> you will see a AGB (have to scroll/read to the bottom of it) -> need to accept them -> and then the real purchase is done.

Thanks for any help in advance.

Regards

[Rabby]

Nobody got an idea how to achieve this?