3 Improvements would benefit end user.
There are 3 things I wish this app provided that it doesn’t. {1} While the app seems to run fine, there is a delay to notify of transactions. This should be immediate when using your card. {2} There is also no sound to alert you audibly for any transaction type. {3} There is a limit to how far back you can go into your purchase history. “Other cards” do these things well, and would seem like a baseline reference standard. Please seriously consider these updates, as I believe your customer base would highly appreciate it.