Possible to generate a Bearer token with just username and password credentials and no other tool?

Question

I am very new to API authentication, and have been getting by using Basic Authentication, with simple username and password. I've used Base64 encoding methods to generate a "key value" that has worked for me in the past.

Now I am faced with an API service that asks me to provide a Bearer token. I have no idea how to create one.

I've Googled around for answers, and this seems to be the best answer yet

However, it requires me to have a StackHawk account, plus Github and Python.

Is there no simpler way to get a Bearer token, without all these software hoops?

I've tried using Postman, but there's no obvious feature in the program to generate a Bearer token. Providing my Basic credentials in Postman and requesting a GET call, works fine, but the Authentication string is a Basic one, not a Bearer token.

Any direction to a simpler way of generating a Bearer token is appreciated.

Thanks