3 Improvements would benefit end user.
{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.