Using Apple Card with Banktivity

You can't add Apple Card to any financial app like Banktivity, Quicken, etc. However you can manually import transactions to Banktivity. To export them from Apple Card in preparation for importing to Banktivity, see the following from See your Apple Card spending history - Apple Support

How to export and download your Apple Card transactions

1. Open the Wallet app on your iPhone and tap Apple Card.
2. Tap Card Balance.
3. Under Statements, tap the statement you want to export.
4. Tap Export Transactions, then email, print, save, or share the file.

You can export or download transactions from a previous month as a .CSV or .OFX file to use with third-party financial apps and programs that support those file formats.

The following from Banktivity support https://www.iggsoftware.com/support/articles/ibank-5/how-to-use-manualweb-downloads-in-ibank/

may help:

• From Banktivity go to File> Import Transactions and select the download file placed on the Desktop then click “Import”.
• Check the “import into:” drop down at the top of the import window to make sure the proper account is entered there (change the account if necessary).
• When completed, you can drag the download file from your Desktop to the trash.