WebHookOrchestrator.cs

[FunctionName(nameof(WebHookOrchestrator))]
public static async Task<ResultModel> WebHookOrchestrator(
    [OrchestrationTrigger]DurableOrchestrationContext context
    )
{
    var requestVaue = context.GetInput<int>();
    var hookKey = await context.CallActivityAsync<string>(nameof(HookApiRequestActivity), requestVaue);
    await context.CallActivityAsync(nameof(SaveRequestKeyActivity), hookKey);
    var result = await context.WaitForExternalEvent<ResultModel>(HookWaitEventName);
    return result;
}