A challenge to refactor a payment service using SOLID principles.

1. .Net Framework 4.5.2

This project contains the library code.

This project contains the unit tests.

1. Add StyleCop or some other static code analysis tool

2. Add unit tests for the EF access classes

3. Add error handling logic including rolling back a transaction if it fails part way through

4. Make code asynchronous and add cancellation support

5. Add transaction to credit creditor account

6. Redevelop in .Net Core