Get GTIN or MPN values from products added to products by our product feed manager and create shortcodes to use on website

shortcodes_unique_identifiers.php

<?php

// MPN shortcode function
function wppfm_brand_shortcode() { 
  // get MPN value. 
  //$r = get_post_meta( $post->ID, 'wppfm_product_brand', true );
  $r = get_post_meta( get_the_ID(), 'wppfm_product_brand', true );
  
  // return MPN
  return $r;
} 
// register shortcode
add_shortcode('wppfm-brand', 'wppfm_brand_shortcode');


// MPN shortcode function
function wppfm_mpn_shortcode() { 
  // get MPN value. 
  //$r = get_post_meta( $post->ID, 'wppfm_product_mpn', true );
  $r = get_post_meta( get_the_ID(), 'wppfm_product_mpn', true );
  
  // return MPN
  return $r;
} 
// register shortcode
add_shortcode('wppfm-mpn', 'wppfm_mpn_shortcode'); 

// GTIN shortcode function
function wppfm_gtin_shortcode() { 
  // get GTIN value. 
  //$r = get_post_meta( $post->ID, 'wppfm_product_gtin', true );
  $r = get_post_meta( get_the_ID(), 'wppfm_product_gtin', true );
  
  // return GTIN
  return $r;
} 
// register shortcode
add_shortcode('wppfm-gtin', 'wppfm_gtin_shortcode'); 


// you can even create a little snippet to add the unique identifier after the price information
add_action( 'woocommerce_single_product_summary', 'wppfm_gtin_display', 15 );
function wppfm_gtin_display() {
  $r = get_post_meta( get_the_ID(), 'wppfm_product_gtin', true );
  print '<p id="cont-gtin">GTIN: '. $r .'</p>';
}