Task description:

Merchants have many payment transactions of different types.

Transaction Types:

1. Authorize transaction - has amount and used to hold customer's amount
2. Charge transaction - has amount and used to confirm the amount is taken from the customer's account and transferred to the merchant

• The merchant's total transactions amount has to be the sum of the approved Charge transactions

3. Refund transaction - has amount and used to reverse a specific amount (whole amount) of the Charge Transaction and return it to the customer

• Transitions the Charge transaction to status refunded
• The approved Refund transactions will decrease the merchant's total transaction amount

4. Reversal transaction - has no amount, used to invalidate the Authorize Transaction

• Transitions the Authorize transaction to status reversed

Goal is to propose an API to create transactions.

Solution

API:

api/v1/transactions => transations#create

PARAMS:

• :amount
• :type # one of (authorized charged refunded)
• :transaction_id # for charged and refunded transaction types

How to run:

• run app: docker-compose up app
• run tests: docker-compose run test rspec
• run rails console: docker-compose run app rails c