Genesis: Add Custom Links for 'Buy At' Section (uses custom fields)

functions.php

add_action( 'genesis_after_post_content', 'shireman_do_buyat_section', 5 );
/**
 * Add 'BUY AT' Section for Book URLs on Published Books CPT
 *
 */
function shireman_do_buyat_section() {
	if ( 'we_published-book' == get_post_type() ) {

		echo '<div id="buy-at">';
			echo '<div class="buy-lead-in"><i class="icon-book"></i>BUY AT:';
			echo '</div>';

			echo '<div class="buy-links">';
				we_buy_link( array( 'field' => 'we_amazon-url', 'label' => 'Amazon', 'url' => genesis_get_custom_field('we_amazon-url') . '/&amp;tag=cherylshirema-20', ) );

				we_buy_link( array( 'field' => 'we_barnes-url', 'label' => 'Barnes &amp; Noble', ) );

				we_buy_link( array( 'field' => 'we_kobo-url', 'label' => 'Kobo', ) );

				we_buy_link( array( 'field' => 'we_sony-url', 'label' => 'Sony', ) );

				we_buy_link( array( 'field' => 'we_smashwords-url', 'label' => 'Smashwords', 'after' => '', ) );

				// Check if ASIN is entered. If so, display Kindle Price
				if( genesis_get_custom_field('we_amazon-asin-book') != '' ) {
					$ASIN = genesis_get_custom_field( 'we_amazon-asin-book' );
					if ( function_exists(amazon_shortcode) ) echo amazon_shortcode("template=kindle price&asin='$ASIN'");
				}

				// Check if Amazon ISBN-10 is entered. If so, display paperback Price
				if( genesis_get_custom_field('we_createspace-isbn-10') != '' ) {
					$ISBN10 = genesis_get_custom_field( 'we_createspace-isbn-10' );
					if ( function_exists(amazon_shortcode) ) echo amazon_shortcode("template=amazon paperback price&asin='$ISBN10'");
				}

			echo '</div><!--end .buy-links -->';
		echo '</div><!--end #buy-at -->';
	}

}

/**
 * Outputs Buy Link HTML
 *
 * @param array $args Array of output arguments
 */
function we_buy_link( $args ) {
	$defaults = array(
		'field' => '',
		'url'   => '',
		'label' => '',
		'after' => ' &#124;',
	);

	$args = wp_parse_args( $args, $defaults );

	$url = isset( $args['url'] ) ? esc_url( $args['url'] ) : esc_url( genesis_get_custom_field( $args['field'] ) );

	if( genesis_get_custom_field( $args['field'] ) ) { ?>
		<div class="buy-link">
			<a href="<?php echo $url; ?>" target="_blank"><?php _e( $args['label'], 'child' ); ?></a><?php echo $args['after']; ?>
		</div>
	<?php }

}