CoinLedger only needs "Read" or "View" access to import your trade history. This permission protects your accounts. Learn more about API access in this article here.
Login to your CoinJar account.
Click the setting icon in the top right corner and then select the API Keys option.
Click Create New Key.
Select read only as the Scope of the API Key and then select Create Key.
Write down your API secret key, as it will not be shown after closing the dialog.
Navigate to the CoinJar Exchange tab inside CoinLedger and click Auto-Import, enter your API Key into the provided text box.
Finally, click Sync Transactions to import your transaction history.