How do you download more than 3 months of credit card transactions into Quickbooks ?

Contact and ask your bank to send you a file to import into your QBO account. Another option, utilize MT Online as a workaround. It is designed to import into any bank or credit card in QuickBooks Online, so there is no specific setting needed. 

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Hi there, @matrimon-yahoo-c.

I'm glad to guide you on importing your bank transactions to QuickBooks Online. 

First off, you'll need to visit your bank's website and download the transactions as CSV. Then, add them to QuickBooks.

Here's how: 

1. Go to the Banking or Transactions menu, then proceed to the Banking tab.
2. Click the drop-down list beside Link account, then click Upload from file.
3. Select Browse and select the file you downloaded from your bank, then click Next.
4. Click the drop-down list for QuickBooks account and select the account you want to upload the transactions into.
5. Click Next and follow the onscreen steps to match the columns on the file with the correct fields in QuickBooks.

Once done, click Next and select Let's go.

For further insights, you can also check out this link to view the sample and learn about formatting CSV Files In Excel to Get Bank transactions into QuickBooks.

Once added, you can categorize and match them to the downloaded transactions in the Banking page. 

Feel free to add your reply below if you have follow-up questions while importing your banking transactions. Take care!