[Plugin: Login When Creating a New Plugin]

I am developing a wordpress plugin for our clients. The basic function is to extract some content from the client’s other website to their wordpress website. The plugin will be used by several of our clients, so what we want to make is:

After installation of the new plugin, when the client creating an instance of the plugin, they need to input their ‘username’ and ‘password’. We will validate their identity with our mysql database. If they pass the validation, then they could create an instance of the new plugin. The content would be extracted from an api based on the username they just input.

In a word, my question is: Is that possible to do the credential validation when the client is creating an instance of the plugin?