How to generate authentication token to pull the source files via API service calls using ODI12c ?

Summary:

Is there a way to generate and pass the authentication token dynamically for each file for the Restful API calls?

Content (required):

We need to pull json files from vendor server using Restful API service via ODI 12c , but we are facing a challenge like for every json file it is expecting us to generate a token and pass for authentication.

Is there a way to generate and pass the authentication token dynamically for each file.

Version (include the version you are using, if applicable):

Oracle data integrator 12c

Code Snippet (add any code snippets that support your topic, if applicable):