Looking at the Settings API and you can register new setting using register_setting() but I can't find a way of getting all the settings for a certain plugin.
Let's say I want to get a list with all settings for pluginA, how would you do it?
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Setting aren't registered in the database by plugin, though a plugin should be using an identifying prefix. That is, there is no specific queryable cross-linking in the database between plugin and setting. The only way to way to pull all settings for a plugin is to know what keys the plugin has used to save those settings.