This Postman test extracts the "authorization" and "x-refresh-token" headers from the response and stores them in environment variables "USER_ACCESS_TOKEN" and "USER_REFRESH_TOKEN" if they exist.

postman_test.js

// let data = JSON.parse(responseBody);
var authorization = pm.response.headers.get('authorization')
var refreshToken = pm.response.headers.get('x-refresh-token')
if (!authorization) return
if (authorization) pm.environment.set("USER_ACCESS_TOKEN", authorization?.split(' ')[1]);
if (refreshToken) pm.environment.set("USER_REFRESH_TOKEN", refreshToken);