Java Tech Test

Simple pojo based java test that will cover various aspects of pure java

To Solve:

PART 1

• How long is it taking to run the billing cycle?
• What is the maximum time you would expect the test to run for?
• Why is it taking longer than we expect?
  • How can we fix this?

PART 2

• We want an audit log when a customer is billed. This should print out the credit card number and the amount before the payment and then confirm when the payment has been taken including the time taken.
  • We can only modify the code under com.postman.*

PART 3

• There is an issue with the current EZPayProvider is incorrect. They were trying to ensure that only one unique credit card can be billed at the same time.
  • Create a new provider that ensures that the same credit card cannot be billed concurrently (I.e. the same credit card should be billed synchronously).

PART 4

• We want to be able to use different payment providers based on the card. Create a payment provider that can determine what actual provider to use based on the card number.