Thanks a bunch for your interest in the Nice Memberships extension. It is appreciated.
1) Is possible to make a notification to the user when the subscription ends and he haven´t pay yet?
The extension automatically bills the subscriber using PayPal subscription billing. The extension also automatically emails the subscriber at certain key times, including when the subscription ends.
2) Can I assign a specific article or module to each subscribed member?
The extension relies on Joomla's user groups and user management to provide access to content. The extension will automatically enroll subscribers into Joomla user groups and thus grant or restrict access to articles based on the user group to which the subscriber belongs. The extension does not have a feature for assigning specific articles or modules to specific subscribers. However, if you find an extension that will provide this sort of granular access based to individual users, then the Nice Memberships extension will most likely work with the extension.
~ All the best