itsadim

I asked my client to get the connection updated with PayPal ad was fixed.You need to get in touch with PayPal and get the settings. Then it works

Figured it out, Might be helpful for someone who needs to update:
I got two fields for gallery, a) thumbnail b) Original image size. I got the gallery id to use as url for modal pop up:

<ul class="large-block-grid-5 medium-block-grid-5 small-block-grid-2">
            <?php while(have_posts()): the_post();
            $entries = get_post_meta( get_the_ID(), 'gallery_meta_group', true );
            foreach ( (array) $entries as $key => $entry ) {
              $gallery_image = $origigallery_image = $gal_id='';
              if ( isset( $entry['gallery_image_id'] ) ) {
                $gallery_image = wp_get_attachment_image( $entry['gallery_image_id'], 'share-pick', null, array(
                  'class' => 'thumb',
                  ) );
              }

              if ( isset( $entry['origigallery_image_id'] ) ) {
                $origigallery_image = wp_get_attachment_image( $entry['origigallery_image_id'], 'share-pick', null, array(
                  'class' => 'thumb',
                  ) );
              }

              if ( isset( $entry['gallery_image_id'] ) )
                $gal_id = ( $entry['gallery_image_id'] );
              ?>

              <li>
                <a href="#" data-reveal-id="modal-<?php echo $gal_id; ?>">
                  <div class="image-wrapper">
                    <img src="<?php echo $entry['gallery_image']; ?>">
                  </div>
                </a>
              </li>
              <div id="modal-<?php echo $gal_id; ?>" class="reveal-modal" data-reveal aria-labelledby="modalTitle" aria-hidden="true" role="dialog">
               <img src="<?php echo $entry['origigallery_image']; ?>">
               <a class="close-reveal-modal" aria-label="Close">×</a>
             </div>
             <?php } ?>
           <?php endwhile; ?>
         </ul>