@pwFoo there was a bug in a code.
Please, update plugin to the last version (0.3.6), change again the lines 60, 61 and 65 of library.js, reload, restart and test again. Sorry for the inconvenience
The plugin allows you to monetize your forum at the expense of paid members
npm i nodebb-plugin-paid-membership
Create checkout on interkassa.com
Q - Is this plugin limited to using this service or could support for other payment systems be integrated?