We are sorry to hear that some apps may fail to install after downloading and are not compatible with your beloved Samsung Galaxy A13.
I really understand where your frustration is coming from, and if it happens to my device, I will feel the same.
For now, Samsung Wallet is not yet officially available here in the Philippines, and incompatibility arises due to the hardware and software limitations of your device. In order to protect your device from failure and other unwarranted complications that may affect its overall functionalities, prior error messages were meant to alert the user to the potential risk it may cause upon installation.
Nonetheless, keep your device up-to-date in order to have the latest features, security, and other improvements on your Samsung device.