dotnet add package Azure.ResourceManager.ApiCenter
dotnet add package Azure.Identity

AZURE_SUBSCRIPTION_ID=<your-subscription-id>
AZURE_RESOURCE_GROUP=<your-resource-group>
AZURE_APICENTER_SERVICE_NAME=<your-apicenter-service>

using Azure.Identity;
using Azure.ResourceManager;
using Azure.ResourceManager.ApiCenter;

ArmClient client = new ArmClient(new DefaultAzureCredential());

Subscription
└── ResourceGroup
    └── ApiCenterService                    # API inventory service
        ├── Workspace                       # Logical grouping of APIs
        │   ├── Api                         # API definition
        │   │   └── ApiVersion              # Version of the API
        │   │       └── ApiDefinition       # OpenAPI/GraphQL/etc specification
        │   ├── Environment                 # Deployment target (dev/staging/prod)
        │   └── Deployment                  # API deployed to environment
        └── MetadataSchema                  # Custom metadata definitions

using Azure.ResourceManager.ApiCenter;
using Azure.ResourceManager.ApiCenter.Models;

ResourceGroupResource resourceGroup = await client
    .GetDefaultSubscriptionAsync()
    .Result
    .GetResourceGroupAsync("my-resource-group");

ApiCenterServiceCollection services = resourceGroup.GetApiCenterServices();

ApiCenterServiceData data = new ApiCenterServiceData(AzureLocation.EastUS)
{
    Identity = new ManagedServiceIdentity(ManagedServiceIdentityType.SystemAssigned)
};

ArmOperation<ApiCenterServiceResource> operation = await services
    .CreateOrUpdateAsync(WaitUntil.Completed, "my-api-center", data);

ApiCenterServiceResource service = operation.Value;

ApiCenterWorkspaceCollection workspaces = service.GetApiCenterWorkspaces();

ApiCenterWorkspaceData workspaceData = new ApiCenterWorkspaceData
{
    Title = "Engineering APIs",
    Description = "APIs owned by the engineering team"
};

ArmOperation<ApiCenterWorkspaceResource> operation = await workspaces
    .CreateOrUpdateAsync(WaitUntil.Completed, "engineering", workspaceData);

ApiCenterWorkspaceResource workspace = operation.Value;

ApiCenterApiCollection apis = workspace.GetApiCenterApis();

ApiCenterApiData apiData = new ApiCenterApiData
{
    Title = "Orders API",
    Description = "API for managing customer orders",
    Kind = ApiKind.Rest,
    LifecycleStage = ApiLifecycleStage.Production,
    TermsOfService = new ApiTermsOfService
    {
        Uri = new Uri("https://example.com/terms")
    },
    ExternalDocumentation = 
    {
        new ApiExternalDocumentation
        {
            Title = "Documentation",
            Uri = new Uri("https://docs.example.com/orders")
        }
    },
    Contacts =
    {
        new ApiContact
        {
            Name = "API Support",
            Email = "api-support@example.com"
        }
    }
};

// Add custom metadata
apiData.CustomProperties = BinaryData.FromObjectAsJson(new
{
    team = "orders-team",
    costCenter = "CC-1234"
});

ArmOperation<ApiCenterApiResource> operation = await apis
    .CreateOrUpdateAsync(WaitUntil.Completed, "orders-api", apiData);

ApiCenterApiResource api = operation.Value;

ApiCenterApiVersionCollection versions = api.GetApiCenterApiVersions();

ApiCenterApiVersionData versionData = new ApiCenterApiVersionData
{
    Title = "v1.0.0",
    LifecycleStage = ApiLifecycleStage.Production
};

ArmOperation<ApiCenterApiVersionResource> operation = await versions
    .CreateOrUpdateAsync(WaitUntil.Completed, "v1-0-0", versionData);

ApiCenterApiVersionResource version = operation.Value;

ApiCenterApiDefinitionCollection definitions = version.GetApiCenterApiDefinitions();

ApiCenterApiDefinitionData definitionData = new ApiCenterApiDefinitionData
{
    Title = "OpenAPI Specification",
    Description = "Orders API OpenAPI 3.0 definition"
};

ArmOperation<ApiCenterApiDefinitionResource> operation = await definitions
    .CreateOrUpdateAsync(WaitUntil.Completed, "openapi", definitionData);

ApiCenterApiDefinitionResource definition = operation.Value;

// Import specification
string openApiSpec = await File.ReadAllTextAsync("orders-api.yaml");

ApiSpecImportContent importContent = new ApiSpecImportContent
{
    Format = ApiSpecImportSourceFormat.Inline,
    Value = openApiSpec,
    Specification = new ApiSpecImportSpecification
    {
        Name = "openapi",
        Version = "3.0.1"
    }
};

await definition.ImportSpecificationAsync(WaitUntil.Completed, importContent);

ApiCenterApiDefinitionResource definition = await client
    .GetApiCenterApiDefinitionResource(definitionResourceId)
    .GetAsync();

ArmOperation<ApiSpecExportResult> operation = await definition
    .ExportSpecificationAsync(WaitUntil.Completed);

ApiSpecExportResult result = operation.Value;

// result.Format - e.g., "inline"
// result.Value - the specification content

ApiCenterEnvironmentCollection environments = workspace.GetApiCenterEnvironments();

ApiCenterEnvironmentData envData = new ApiCenterEnvironmentData
{
    Title = "Production",
    Description = "Production environment",
    Kind = ApiCenterEnvironmentKind.Production,
    Server = new ApiCenterEnvironmentServer
    {
        ManagementPortalUris = { new Uri("https://portal.azure.com") }
    },
    Onboarding = new EnvironmentOnboardingModel
    {
        Instructions = "Contact platform team for access",
        DeveloperPortalUris = { new Uri("https://developer.example.com") }
    }
};

ArmOperation<ApiCenterEnvironmentResource> operation = await environments
    .CreateOrUpdateAsync(WaitUntil.Completed, "production", envData);

ApiCenterDeploymentCollection deployments = workspace.GetApiCenterDeployments();

// Get environment resource ID
ResourceIdentifier envResourceId = ApiCenterEnvironmentResource.CreateResourceIdentifier(
    subscriptionId, resourceGroupName, serviceName, workspaceName, "production");

// Get API definition resource ID
ResourceIdentifier definitionResourceId = ApiCenterApiDefinitionResource.CreateResourceIdentifier(
    subscriptionId, resourceGroupName, serviceName, workspaceName, 
    "orders-api", "v1-0-0", "openapi");

ApiCenterDeploymentData deploymentData = new ApiCenterDeploymentData
{
    Title = "Orders API - Production",
    Description = "Production deployment of Orders API v1.0.0",
    EnvironmentId = envResourceId,
    DefinitionId = definitionResourceId,
    State = ApiCenterDeploymentState.Active,
    Server = new ApiCenterDeploymentServer
    {
        RuntimeUris = { new Uri("https://api.example.com/orders") }
    }
};

ArmOperation<ApiCenterDeploymentResource> operation = await deployments
    .CreateOrUpdateAsync(WaitUntil.Completed, "orders-api-prod", deploymentData);

ApiCenterMetadataSchemaCollection schemas = service.GetApiCenterMetadataSchemas();

string jsonSchema = """
{
    "type": "object",
    "properties": {
        "team": {
            "type": "string",
            "title": "Owning Team"
        },
        "costCenter": {
            "type": "string",
            "title": "Cost Center"
        },
        "dataClassification": {
            "type": "string",
            "enum": ["public", "internal", "confidential"],
            "title": "Data Classification"
        }
    },
    "required": ["team"]
}
""";

ApiCenterMetadataSchemaData schemaData = new ApiCenterMetadataSchemaData
{
    Schema = jsonSchema,
    AssignedTo =
    {
        new MetadataAssignment
        {
            Entity = MetadataAssignmentEntity.Api,
            Required = true
        }
    }
};

ArmOperation<ApiCenterMetadataSchemaResource> operation = await schemas
    .CreateOrUpdateAsync(WaitUntil.Completed, "api-metadata", schemaData);

// List all APIs in a workspace
ApiCenterWorkspaceResource workspace = await client
    .GetApiCenterWorkspaceResource(workspaceResourceId)
    .GetAsync();

await foreach (ApiCenterApiResource api in workspace.GetApiCenterApis())
{
    Console.WriteLine($"API: {api.Data.Title}");
    Console.WriteLine($"  Kind: {api.Data.Kind}");
    Console.WriteLine($"  Stage: {api.Data.LifecycleStage}");
    
    // List versions
    await foreach (ApiCenterApiVersionResource version in api.GetApiCenterApiVersions())
    {
        Console.WriteLine($"  Version: {version.Data.Title}");
    }
}

// List environments
await foreach (ApiCenterEnvironmentResource env in workspace.GetApiCenterEnvironments())
{
    Console.WriteLine($"Environment: {env.Data.Title} ({env.Data.Kind})");
}

// List deployments
await foreach (ApiCenterDeploymentResource deployment in workspace.GetApiCenterDeployments())
{
    Console.WriteLine($"Deployment: {deployment.Data.Title}");
    Console.WriteLine($"  State: {deployment.Data.State}");
}

using Azure;

try
{
    ArmOperation<ApiCenterApiResource> operation = await apis
        .CreateOrUpdateAsync(WaitUntil.Completed, "my-api", apiData);
}
catch (RequestFailedException ex) when (ex.Status == 409)
{
    Console.WriteLine("API already exists with conflicting configuration");
}
catch (RequestFailedException ex) when (ex.Status == 400)
{
    Console.WriteLine($"Invalid request: {ex.Message}");
}
catch (RequestFailedException ex)
{
    Console.WriteLine($"Azure error: {ex.Status} - {ex.Message}");
}