Custom function that returns the affiliate URL with inserted affiliate ID for any Datafeedr product imported by the Product Sets plugin and saved as a WooCommerce External Product. [datafeedr]

mycode_dfrapi_url.php

<?php

/**
 * Returns the affiliate URL with inserted affiliate ID for any
 * Datafeedr product imported by the Product Sets plugin and
 * saved as a WooCommerce Product.
 * 
 * Usage: $url = mycode_dfrapi_url( $product );
 *
 * Returns an empty string if no Datafeedr product exists.
 *
 * @param WC_Product $product
 *
 * @return string URL or empty string.
 */
function mycode_dfrapi_url( WC_Product $product ) {

	$dfrps_product = get_post_meta( $product->get_id(), '_dfrps_product', true );

	if ( empty( $dfrps_product ) ) {
		return '';
	}

	$url = dfrapi_url( $dfrps_product );

	return $url;
}