You are probably looking for these two resources:

• google_iap_brand - https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/iap_brand

• google_iap_client - https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/iap_client

However, Google recently announced deprecation of the API that these resources use (https://cloud.google.com/iap/docs/deprecations/migrate-oauth-client).

I got in touch with Google Cloud support, and they confirmed that these two resources will no longer work after July 2025.

Here is full response that I got from the support: https://github.com/hashicorp/terraform-provider-google/issues/21378#issuecomment-2653497606