I would recommend placing the contents of the JSON file inside a service variable, and reading from it from inside your app.

Some extra commentary here, because I spent a few hours going through local > deployment loop to figure this out:

```
credentials = service_account.Credentials.from_service_account_info(

json.loads(os.environ.get("GOOGLE_APPLICATION_CREDENTIALS_JSON"))

)

opts = ClientOptions(api_endpoint=f"...")

client = something.yourClient(client_options=opts, credentials=credentials)
```

The JSON needs to be formatted without linebreaks as a single line, the linebreak characters inside of the private_key, don't touch those. But it should be all on the same line, with no external quotes when you paste it into railway. The string you paste into the GOOGLE_APPLICATION_CREDENTIALS_JSON variable should be like:

```
{"type":"service_account", "project_id":"your-project-id",...}
```
No outside quotes!