This code will add the merchant logo (if the logo exists) to the WooCommerce single product page. [datafeedr]

add-merchant-logo-to-product-details-page.php

<?php

/**
 * Add merchant logo (if it exists) to product details page.
 */
add_action( 'woocommerce_external_add_to_cart', 'mycode_add_merchant_logo_to_single_product_page' );
function mycode_add_merchant_logo_to_single_product_page() {
	global $product;
	if ( dfrpswc_is_dfrpswc_product( $product->id ) ) {
		$postmeta = get_post_meta( $product->id, '_dfrps_product', true );
		$title    = esc_attr( $postmeta['merchant'] );
		$merchant = esc_html( $postmeta['merchant'] );
		$url      = 'https://images.datafeedr.com/m/' . $postmeta['merchant_id'] . '.jpg';

		echo '<style type="text/css">.dfr_missing_logo span{display:inline;}.dfr_missing_logo img{display:none;}</style>';
		echo "<img onerror='this.parentNode.className += \" dfr_missing_logo\"' src='$url' alt='$title' title='$title'><span style='display:none;'>$merchant</span>";
	}
}