How to change product image thumbnail size on Easy Digital Downloads checkout page

By default product thumbnails on EDD checkout page appear very tiny (25 x 25). Here’s the code snippet to set a custom image size for the same:

add_filter( 'edd_checkout_image_size', 'filter_edd_checkout_image_size', 10, 1 );
/**
 * Change product image thumbnail size on Easy Digital Downloads checkout page.
 *
 * @param array $array default image size (25 x 25).
 * @return custom image size
 */
function filter_edd_checkout_image_size( $array ) {
    return array( 777, 0 );
}

In the above, I am setting 777px as the width and letting WordPress use the proportionate height per the image’s aspect ratio.