Firestore Connexion

If I understand it correctly, the workflow you want to achieve is:

  1. First POST request that returns access token
  2. Save the access token in 1 as an environmental variable
  3. Use the environmental variable in the next GET request

If that’s what you want to achieve, you can use Tests script where you can set environmental variable. e.g.

pm.environment.set(‘accessToken’, accessToken)

If you would like to know more about scripting, here is the reference:

I hope this helps.
Please feel free to reach out fi you have more questions!