Transactions

Reverse engineering transaction behavior from a transaction log in csv format.

Scenario

• Use a csv based log file for transactions to track account balances and transaction history.
• The accounts should be initialized with a given log file.
• New changes to the accounts should log the transaction details to the log file.

The types of interactions are simple:

• Deposit: The amount is added to the account balance.
• Withdrawal: The amount is subtracted from the account balance.
• Dispute: The transaction is marked as disputed and does not count towards the account balance.
• Resolve: The disputed transaction is resolved and the original transaction is put in effect again.
• Chargeback: The disputed transaction is voided and the transaction has no impact on the account balance.

This leads to a simple state machine of transactions:

flowchart TD
    created -- Dispute --> disputed
    disputed -- Resolve --> resolved
    disputed -- Chargeback --> voided

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TODOs

• API for generating transactions based on the accounts
• Tests