You will need to submit your Authorize.Net API key to PayTraQer to get access to download and sync your Authorize.Net transactions to your QuickBooks Online company.
Here are the steps to get your Authorize.Net API key.
Step 1: Log in to your Authorize.Net account.
Step 2: Click the ‘Account’ tab and choose ‘Settings’ from the list, at the left of your screen.
Step 3: Select ‘API Credentials & Keys’ under the Security Settings.
Step 4: You can see your API Login ID there. Copy it to your clipboard. & paste it into the PayTraQer authorization screen for verification.
Step 5: Select the "New Transaction Key" option under the "Create New Key(s)" section and click Submit.
Copy the App Id and Transaction key to PayTraqer Screen.
To know how to connect your Authorize.Net account to your PayTraQer, read this article.