New Access Token for Customer of Product

I want to have the customer generate a new access token every time they login to my website via API.

Right now, every time a new customer is created on my web app, I create a customer in Particle Cloud for my Product.

My question is, can I use the same call to create a customer to get a new access token or will this create another Customer in the Particle cloud? Or is there another call that I am not aware of?