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Card Management Service

L02

  • Create and set up a template project
  • Set up the configuration from file and environment variables
  • Middleware for logging requests
  • Middleware for adding and getting cards for user
  • Store data in memory
  • Card model:
    • Id
    • CVC
    • Pan (card number)
    • Expire (expiration date)
      • Month
      • Year
    • Name (card name, user-defined)
    • IsDefault (whether the card is default payment card)
    • UserId
$Env:ASPNETCORE_ENVIRONMENT = "Development"
dotnet run --launch-profile "Development"

$Env:ASPNETCORE_ENVIRONMENT = "Staging"
dotnet run --launch-profile "Staging"

dotnet run --no-launch-profile

L03

  • Added controllers for:
    • adding a card
    • deleting a card
    • getting a card or cards
    • changing card's name
  • Configured swagger
  • Added filters for logging requests and responses which hides card's secret data:
    • only 4 last digits of the pan is shown
    • CVC is hidden completely
  • Added validation in one base model:
    • Luhn algorithm
    • card expiration date
    • during adding (including exceptions)

L04, L05

  • Added
    • Entity Framework (EF) Core
    • PostgreSQL DB
    • Repository pattern for interaction with DB
  • Removed
    • In-memory data

L06

  • Added controller for Operations
    • Get (CardId param is optional)
      • /operation?cardId
      {
          "cardId": "d29f2fb4-409c-40b0-ad1e-4baa1758ea8e",
          "name": "operation02",
          "amount": 2
      }
    • Add operation with default card (Default card should exist)
      • /operation
      {
          "name": "operation02",
          "amount": 2
      }
    • Add operation with cardId. CardId should exist
      • Post /operation
      {
          "cardId": "d29f2fb4-409c-40b0-ad1e-4baa1758ea8e",
          "name": "operation02",
          "amount": 2
      }
    • Add operation with new card
      • Post /operation
      {
          "name": "operation01",
          "amount": 1,
          "card": {
              "pan": "4929722798964846",
              "expire": {
                  "Month": 1,
                  "Year": 2022
              },
              "cvc": "132"
          }
      }
  • The application was created taking into account 12 factors

L07

L08

  • Created a new service of operations
  • Operations API has been moved to a new service
  • When carrying out an operation using new details, an asynchronous message is sent about the creation of a new card (the card Id is generated in the operation service).
    • RabbitMQ message broker
    • EasyNetQ library
  • When carrying out an operation by card Id, the default card is requested synchronously
  • The default card for transactions is requested synchronously

L09-10

  • For HTTP communication between map services and operations, a policy has been configured using the Polly library for:
    • Retry
    • Circuit Breaker

Diagrams

Architecture

DB

Data

Rights Db (User)

Name Password AccessToken
Admin 1234 qwerty

Balancer DB (Route)

Number ObjectName ResourceConnection
1 card {card-service}/card
2 operation {operation-service}/operation
# {card-service} {operation-service}
debug https://localhost:44333 https://localhost:44395
IIS http://localhost/cardDataService http://localhost/operationDataService
docker http://card-service http://operation-service

Card Db (Card)

Id Cvc Pan Name IsDefault UserId ExpirationDate
d29f2fb4-409c-40b0-ad1e-4baa1758ea8e 001 4360251111335365 card01 ✔️ 65ebe5d1-a883-46e2-805a-4c2d44eab438 12/2099
57d92bd8-413e-4377-8de2-f69d57ece143 002 4024007173305771 card02 65ebe5d1-a883-46e2-805a-4c2d44eab438 06/2026
e0c6d6a1-5386-4690-9d63-23964e4be74f 003 2720473437781424 card03 ✔️ 3fa85f64-5717-4562-b3fc-2c963f66afa 05/2025

Operation Db (Operation)

Id CardId Name Amount
48310dbe-a8b8-47b0-a21f-3180f656ce35 d29f2fb4-409c-40b0-ad1e-4baa1758ea8e Petrol 1200
29d9170f-f06b-4c6f-ae9a-7f427517f171 57d92bd8-413e-4377-8de2-f69d57ece143 Products 2500
86fe5988-d76f-45ae-aefa-fe2dfd7e0e49 e0c6d6a1-5386-4690-9d63-23964e4be74f Phone 37000