We want to give our customer the best experience possible. So we should inform them about the details of his/her card like:

• valid/not valid
• the scheme (i.e VISA, MASTERCARD or AMEX)
• the bank when it is available

In order to do so, you should create a simple Spring REST api service that will understand the following call and response structure:

 GET /card-scheme/verify/234564562....
 {
   "success": true
   "payload" : {
        "scheme": "visa",
        "type" : "debit",
        "bank" : "UBS"
 }    
}
# Number of hits
GET /card-scheme/stats?start=1&limit=3
{
  "success": true
  "start": 1,
  "limit": 3,
  "size": 133,
  "payload": {
    "545423": 5,
    "679234": 4,
    "329802": 1
  }
}

To gather this data, you should use a 3rd party API, such as https://binlist.net/

• Try to show your OOP skills
• Database modelization, using JPA or ORM
• Code standards/clean code
• Software patterns
• Performance and number of requests to the 3rd Party API
• Unit tests.
• Create a simple UI for the endpoints and display the output properly.

Create a repository on github for code and make frequent commit as you develop your API.