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I'm sorry, but the information extracts provided do not contain details on connecting to the Ory Network using gRPC. The extracts mainly focus on REST APIs and SDK usage. However, you can refer to the Ory documentation for more information on gRPC usage: - [Ory Keto gRPC API Reference](https://www.ory.sh/docs/keto/reference/api#tag/Check-API) Please note that the provided link is for Ory Keto, which is a part of the Ory ecosystem. Make sure to review the documentation to understand how it fits into your use case and if it supports gRPC for the specific Ory service you are interested in.

To check permissions in your backend app using Ory Network, you can follow these steps: 1. Define your permission model using the Ory Permission Language (OPL). You can create permission rules with OPL using the Ory Console. Go to [Ory Console](https://console.ory.sh/) → Namespaces & Rules and use the editor in the Permission Rules tab. Here's an example of OPL code:

typescript import { Namespace, Context } from "@ory/keto-namespace-types"  class User implements Namespace {}  class Document implements Namespace {   // All relationships for a single document.   related: {     editors: User[]     viewers: User[]   }    // The permissions derived from the relationships and context.   permits = {     write: (ctx: Context): boolean => this.related.editors.includes(ctx.subject),     read: (ctx: Context): boolean => this.permits.write(ctx) || this.related.viewers.includes(ctx.subject),   } }

2. Set up relationships and permissions using the Ory Console or the Ory CLI. You can find more information on configuring Ory Permissions in the [Configure Ory Permissions guide](https://www.ory.sh/docs/guides/cli/configure-permission-service). 3. To check permissions in your backend app, you can use the Check API. The Check API allows you to check if a user has a specific permission. Here's an example of how to use the Check API based on the [Basic concepts > Checking permissions](https://www.ory.sh/docs/guides/permissions/overview#get-started-with-ory-permissions) section:

plaintext is users:user1 in readers of files:file1? // Yes

Unfortunately, the information extracts do not provide specific code examples for making API calls from your backend app. However, you can refer to the [Ory Keto API Reference](https://www.ory.sh/docs/keto/reference/api) for more details on how to interact with the API. Please note that the provided links and examples are for Ory Keto, which is a part of the Ory ecosystem. Make sure to review the documentation to understand how it fits into your use case.

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