You may need to perform this procedure, depending on your current certificate store.

  1. In Postman, click on the spanner icon and choose “Settings”:
    Image 1

  2. Navigate to the “Certificates” tab and click on “Add certificate”:
    Image 2

  3. Add this certificate with the following details.   You may need to change the file  extension from “.txt” to “.crt”:
    Image 3

  4. When coding your integration, you will also need to add this certificate authority into the relevant trust stores on your applications.