The color of the text for the primary button in your PaymentSheet, represented as a hex string with format #RRGGBB or #AARRGGBB.
The border color used for the primary button in your PaymentSheet, represented as a hex string with format #RRGGBB or #AARRGGBB.
The background color used for the primary button in your PaymentSheet, represented as a hex string with format #RRGGBB or #AARRGGBB.