Durable Function sample for Azure Portal

function.jason(E1_SayHello)

{
  "bindings": [
    {
      "name": "helloContext",
      "type": "activityTrigger",
      "direction": "in"
    }
  ],
  "disabled": false
}

function.json(E1_HelloSequence)

{
  "bindings": [
    {
      "name": "context",
      "type": "orchestrationTrigger",
      "direction": "in"
    }
  ],
  "disabled": false
}

function.json(HttpStart)

{
  "bindings": [
    {
      "authLevel": "anonymous",
      "name": "req",
      "type": "httpTrigger",
      "direction": "in",
      "route": "orchestrators/{functionName}",
      "methods": [
        "post"
      ]
    },
    {
      "name": "$return",
      "type": "http",
      "direction": "out"
    },
    {
      "name": "starter",
      "type": "orchestrationClient",
      "direction": "in"
    }
  ],
  "disabled": false
}

run.csx (E1_SayHello)

#r "Microsoft.Azure.WebJobs.Extensions.DurableTask"

public static string Run(DurableActivityContext helloContext)
{
    string name = helloContext.GetInput<string>();
    return $"Hello {name}!";
}

run.csx(E1_HelloSequence)

#r "Microsoft.Azure.WebJobs.Extensions.DurableTask"

public static async Task<List<string>> Run(DurableOrchestrationContext context)
{
    var outputs = new List<string>();

    outputs.Add(await context.CallFunctionAsync<string>("E1_SayHello", "Tokyo"));
    outputs.Add(await context.CallFunctionAsync<string>("E1_SayHello", "Seattle"));
    outputs.Add(await context.CallFunctionAsync<string>("E1_SayHello", "London"));

    // returns ["Hello Tokyo!", "Hello Seattle!", "Hello London!"]
    return outputs;
}

run.csx(HttpStart)

#r "Microsoft.Azure.WebJobs.Extensions.DurableTask"
#r "Newtonsoft.Json"

using System.Net;

public static async Task<HttpResponseMessage> Run(
    HttpRequestMessage req,
    DurableOrchestrationClient starter,
    string functionName,
    TraceWriter log)
{
    // Function input comes from the request content.
    dynamic eventData = await req.Content.ReadAsAsync<object>();
    string instanceId = await starter.StartNewAsync(functionName, eventData);
    
    log.Info($"Started orchestration with ID = '{instanceId}'.");
    
    return starter.CreateCheckStatusResponse(req, instanceId);
}

Durable Functions / Samples . I write a code for Azure Portal.