How to organize payment acceptance in the browser extension?

Question

Payment systems

Good evening. I want to add payment acceptance to the extension. Preferably via SMS. After payment, new features will appear in the extension. Only these features will be initially in the extension, but closed before payment. Those. it will not be possible to download new functionality from the server, since according to the rules of the Opera, all code must be located on the client.
Essentially I need to do the following. A person sends an SMS, he receives a code that he enters in the field, if the code is correct, a new functionality opens.
How to do it? What do you advise?