Questions about user registration limitations and monetization

[curiosport]

Hi. I have a few questions regarding user registration and monetization on a Misskey instance:

1. Is it possible to restrict user registration only to those who have an invitation code?

2. I'm considering charging users a fee to register on my instance. Would doing so violate Misskey's license or any of its conditions?

3. If I implement a payment system, am I required to publish the source code of the payment implementation?

4. Lastly, does Misskey include any built-in support for payment systems like PayPal or Stripe, or would I need to integrate that myself?

Thanks in advance for your help!

[syuilo]

1. Yes.
2. No.
3. Yes.
4. No.

[MomentQYC]

Since Misskey's security has not been fully enhanced at this time, it is not yet suitable for integrated payment systems.

[curiosport]

So, an external payment system could be useful in this case. Please give me more information on how the invitation codes for registration work. Can they be created in batches? Can they be unique codes per registration?

[curiosport]

I read a bit of the API documentation, as it appears that it's possible to do everything I asked. The payment system would be external, so there wouldn't be any modifications to Misskey's source code. This leads me to another question: Can I limit access to the content to registered users only? That means if a user isn't logged in, the only thing they'll be able to see on my website is the login form.