Deploying a FastAPI application as an Azure Function involves several steps, starting with ensuring that you have an Azure account and the Azure CLI installed. First, log in to your Azure account and create a resource group, which acts as a container for related resources. Then, establish a storage account with a unique name, followed by creating a function app configured for Python, specifying the runtime version and other necessary parameters. A simple FastAPI webhook application is then developed, featuring dependencies listed in a requirements.txt file, and an `__init__.py` file with the FastAPI app code employing AsgiMiddleware for handling HTTP requests. The application requires several JSON configuration files, such as host.json, local.settings.json, and function.json, to define settings for the Azure Functions host and local development. After verifying the function locally, it can be deployed to Azure, where it is tested for functionality via a provided test script. Any remote issues can be diagnosed using Azure's logging capabilities, and redeployment is straightforward if changes are necessary.