The "API" template in ASP.NET Core is specifically designed to configure a project for building web applications that primarily expose web APIs. This template sets up the project with minimal middleware and settings for handling HTTP requests and responses, making it suitable for building RESTful APIs.

Integration tests focus on testing the interactions and collaborations between different units or components within a system. These tests ensure that the integrated parts work correctly together.

The role of the wwwroot directory in an ASP.NET Core application is to host static web assets, such as HTML files, images, JavaScript files, and CSS stylesheets. These assets are meant to be directly accessible by clients (e.g., web browsers) without going through server-side code. Placing static files in the wwwroot folder ensures they can be served efficiently and improves the performance of the web application.

In this scenario, the most suitable approach is "Database-First." This approach involves generating data models based on an existing database schema. Entity Framework Core provides tools like scaffolding to create models from an existing database, making it easier to work with legacy databases in your ASP.NET Core project.

The tool that became instrumental in converting configurations and dependencies during the migration from project.json to csproj was 'dotnet migrate.' It helps automate the migration process, ensuring a smoother transition for existing projects.

In ASP.NET Core Identity, the CreateAsync method of the UserManager class is used to simultaneously create a user and assign a password. This method takes a user object and a password as parameters, and it handles the user creation and password hashing in a secure way.

To change the way request logging is handled in an ASP.NET Core application, you typically modify the Startup.cs file. This is where you configure various aspects of your application, including logging middleware and settings.

To manage application secrets without storing them in the source code, ASP.NET Core introduced the Configuration manager. This manager allows developers to store sensitive information like connection strings, API keys, and passwords outside of the codebase, typically in environment variables or configuration files. It enhances security and facilitates configuration management.

The default folder for storing and serving static files in an ASP.NET Core web application is the 'wwwroot' folder. Files placed in this directory can be directly accessed by clients, making it an ideal location for assets like CSS, JavaScript, and images.

To create a user programmatically in ASP.NET Core Identity, you would typically make use of the CreateAsync method provided by the UserManager class. This method allows you to create a new user by specifying their details and asynchronously adds them to the user store.