To disable Postman from certificate verification:

  1. Click the Spanner icon (Image of Spanner icon wrench) in the top-right corner of the Postman client.

    You see a drop-down list.

  2. Select Settings from the list.
    Screen capture of settings in the drop-down menu from the spanner icon
  3. In the Settings window, to disable SSL certificate verification, in the SSL certificate verification row of the Request list, click the toggle.
    Screen capture of SSL verification button in the settings window

    When the setting is disabled, you see the word Off.