How to Fetch Bearer Token in Magento 2

The admin token is the digital key to perform the admin-level actions in Magento 2. If you are developing a new Magento 2 backend, and want to perform admin-level actions, then you must pass the admin access token along with the API request.

Sometimes, the developer may require to fetch bearer token in Magento 2 for multiple purposes. In such cases, you can use the programmatic solution to get the authorization token if exists.

The method to do that includes a few lines of code that uses the getAuthToken() public function. 

You can use the complete solution at https://meetanshi.com/blog/fetch-bearer-token-in-magento-2/