Summary

The Card cost calculator API is a case study of implementing an external API Integration

Based on card number, using the first 6 digits of a payment card number (credit cards, debit cards, etc.) identify the institution that issued the card to the card holder and calculate the cost.

Clearing cost matrix:

Issuing Country, Cost (USD)

• US , $5
• GR , $15
• Others , $10

Tools that I used:

• H2 in memory database
• OpenApi spec , to generate and document the API (thanks openapi && swagger <3 )
• Lombok library to reduce boilerplate code for model/data objects (thanks lombok <3 )

##H2 in memory DB http://localhost:8080/h2-console

Postman requests

Content-Type: application/json

OpenApi

You can check the documentation by using:

• postman GET request http://localhost:8080/v2/api-docs

or

• hit on browser: http://localhost:8080/swagger-ui.html

todo:

adding Security + Application Scaling