Triple Crown Frequent Buyer Question

I’m on my 4th $25 card. I use it towards feed, etc and put the balance of the purchase on my cc

I have given up trying to use the card at my local employee-owned feedstore.
Their card machine does not allow them to do much more than swipe or read the chip. Cannot enter anything as DR or CR or an amount besides purchase + tax.
Since posting, I have bought a friend & myself lunch on the card. No problem.

With the small balance left, I will put it toward my next TC Sr purchase at TSC.
Assuming their card system us more sophisticated.