PKPaymentButtonStyle.whiteOutline
A white button with black lettering and a black outline.
Declaration
case whiteOutlineDiscussion
Use the white button with black outline on white or very light backgrounds that don’t provide sufficient contrast for a plain white button. Don’t place this button on dark or saturated color backgrounds. Use the white button instead.
In many cases, you can choose either the white button with black outline or the black button. Select the button that works best with your user interface. Always use a single style throughout your app.