• Add and configure new Web API project.
• Extract payment gateways code from .Infrastructure project into .PaymentGateways
• Implement controller for accessing payment gateway functionality publicly

• Install and configure Swashbuckle.AspNetCore (Swagger)
• Generate OpenAPI specification
• Generate Swagger UI documentation
• Update README file

• Install Entity Framework Core along with dependencies
• Create SQL Server data context class in RubyRemit.Data project
• Create new RubyRemitDB database
• Scaffold database objects with EF Core Code-First approach

• Add and configure new class library project
• Define interfaces/contracts for expected functionality
• Implement functionality via classes
• Extract code from .Infrastructure project into .Business project as necessary

Define data service contracts as follows:

• IPaymentData interface
• IPaymentStateData interface

Define PaymentValidator class to implement IPaymentValidator interface.

Implement the following methods:

• IsValidCardNumber()
• IsValidHolderName()
• IsValidExpiryDate()
• IsValidSecurityCode()
• IsValidAmount()

Define PaymentData class to implement IPaymentData interface.

Implement the following methods:

• CreatePayment()
• GetAllPayments() (with optional sort and filter parameters)
• GetPaymentDetails() (with paymentId parameter)
• CheckPaymentSuccess() (with paymentId parameter)
• CountPaymentAttempts() (with paymentId parameter)

• Install and configure xUnit package
• Write unit tests for all features

Define Gateways controller class with the following action:

• POST /api/gateways/process

• Publish solution in release configuration
• Add Dockerfile and build Docker image
• Set up hosting environment on Heroku
• Set up SQL Server add-on on Heroku
• Run migration on production database
• Seed production database, if necesssary
• Update GitHub repository with live demo link

• Create repository
• Prepare local dev. environment
• Scaffold new multi-project solution

Define PremiumPaymentService class to implement IExpensivePaymentGateway interface.

Implement the following required method:

• ProcessPayment()

Define payment service contracts as follows:

• IPaymentGateway interface
• IExpensivePaymentGateway interface
• ICheapPaymentGateway interface

• Set up folder structure
• Configure project dependencies
• Register required services in Startup.cs for dependency injection
• Configure Request pipeline plus error handling in Startup.cs

Define Payments controller class with the following actions:

• POST /api/payments/processpayment

Define entity classes with their respective properties:

• Payment class
• PaymentState class

Define necessary enumeration / look-up types:

• State enum (pending | processed | failed)

Enhance entity definitions with:

• Data annotations
• Relationships

Define BasicPaymentService class to implement ICheapPaymentGateway interface.

Implement the following required method:

• ProcessPayment()