Add custom class to Direct Stripe button via filter hook

Direct Stripe button classes are filtered via the hook ‘direct_stripe_button_class’

 

Example to add a class to the button, keeping existing classes :

function ds_add_button_class( $classes ) { 
 $return = $classes; 
 $return .= ' my-class'; 
  return $return; 
} 
add_filter('direct_stripe_button_class', 'ds_add_button_class', 10 );