The Payage gateways offer a choice of payment buttons as images or responsive HTML/CSS buttons.
The gateways supply at least three button images, for example:
The images are in this directory, and you can add your own images here:
/images/pay_buttons
The payage.css provides default hover styling for the image buttons, but you can add your own. The unframed transparent images offer the best possibilities for customisation, since you can add background colours, gradients, and borders. Add your styling to the Custom CSS tab.
The responsive buttons are also styled by the payage.css file. You can override the default styling by adding rules to the Custom CSS tab. The icons used for the responsive buttons are in this directory:
/media/com_payage/icons
You can add more icons, but to be recognised by the icon picker, they must be .png files with height less than 45 pixels. The supplied icons are transparent .png files with a height of 36px.