I understand. I would prefer to handle this using a filter hook potentially. We can add a new filter or action hook that you can use to add the desired no-index parameters to your site. This will ensure that there cannot be any unexpected result on a lot of other sites that doesn’t want it.
You can suggest a hook that will help you do this for your site. You can also create a pull request on the Stripe plugin’s repository:
https://github.com/Arsenal21/stripe-payments