Background:

The system simulates a transaction intent management tool to handle the process from initialization to completion and calculate the final balances of merchants' accounts. Transaction states include:

• PENDING: The transaction is created and awaiting processing.
• IN_PROGRESS: The transaction is being processed.
• DONE: The transaction is completed, and the balance is updated.

Core Features:

1. START (optional): Initializes a merchant account with an initial balance and an optional refund limit.
2. NEW: Creates a transaction intent for the specified account with the given amount in the PENDING state.
3. PROCESS: Moves a transaction from PENDING to IN_PROGRESS.
4. COMPLETE: Moves a transaction from IN_PROGRESS to DONE and adds the amount to the merchant's balance.

Example:

Input:

START account1 0
NEW txn1 account1 50
PROCESS txn1
COMPLETE txn1

Output:

account1 50

Extended Features:

1. MODIFY: Updates the amount for a PENDING transaction intent.
2. CANCEL: Reverts a transaction from IN_PROGRESS to PENDING.
3. RETURN: Processes a refund for a DONE transaction and deducts the amount from the account's balance.

Example:

Input:

START account1 0
NEW txn1 account1 50
PROCESS txn1
CANCEL txn1
PROCESS txn1
COMPLETE txn1
RETURN txn1

Output:

account1 0

Time-Limited Refunds:

Each command includes a marker indicating the timestamp. Merchants can set a refund time limit; transactions can only be refunded within this limit.

• If no limit is set, refunds are allowed indefinitely.
• A limit of 0 means no refunds are allowed.

Example:

Input:

1 START account1 0 5
2 NEW txn1 account1 100
8 COMPLETE txn1
11 RETURN txn1
16 RETURN txn1

Output:

account1 100

Task Objective:

Process a list of commands to manage transaction intents and output the final balances of all accounts.

Input Format:

A time-ordered list of commands.

Output Format:

A list of account balances in ascending order by account ID.

Output Example:

["account1 50", "account2 100"]

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