WP Simple Pay: Add Yes and No Values to Checkbox

add_filter(

    'simpay_get_paymentintent_args_from_payment_form_request',

    function( $args ) {

        $args['metadata'] = array_map(

            function( $value ) {

                // If the value is `on` or `off`, change it. Otherwise return the normal value.

                if ( 'off' === $value ) {

				  return 'No';

				} else if ( 'on' === $value ) {

				  return 'Yes';

				}

				return $value;

            },

            $args['metadata']

        );

        return $args;

    }

);