Billing Integration (Stripe, ApplePay and Google Play Payments)

We’re a public cloud service providers and would like to setup a billing system for nextcloud. We also would like to not opensource our code so if an independent app can be developed that would be great.
We’d also like to develop mobile applications for iOS and Android and integrate in-app purchases.
Please let me know what you guys think. I am aware NextCloud is licensed under the GPL license and requires all changes to core published and shared.
Let me know what you guys think. Also if anyone would like to work on this gig, hit me up.

Thanks in advance

Hello @sidk77

Could you please reach me at norman[at]cisinlabs[dot]com or over skype, so that we can discuss in detail and can proceed it further.

Skype: live:norman_2445