Hi, i had question in django rest framework

Hello I am a backend developer who is developing python django.
I sent you an e-mail because I had a question.
Currently, my company provides web services using pure django.
As the company grew bigger and bigger,
the direction of development was decided through api communication by separating the front and backend from one django project,
and we are trying to proceed with api communication using the django rest framework.
At this time, do I have to pay the usage fee when I want to develop it using the django rest framework for commercial purposes in the project currently being serviced by the company?
Or if you can use it without paying the usage fee, do you have to disclose the source or any restrictions under the license?

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