Customizing the Vendor Header

archive-product.php

Copy archive-product.php from WooCommerce into /wp-content/YOURTHEME/woocommerce/archive-product.php

Around line 23 or so, ***ABOVE*** the line that says:

<?php if ( apply_filters( 'woocommerce_show_page_title', true ) ) : ?>

....enter your custom code.

Let's include a sample that checks if the page being loaded is for a vendor, and then do some stuff.  Customize as you need for your own purposes.  The sample below was written for a BuddyPress site that has private messages and profiles.  The [button] shortcode is instead of just displaying text.  Again, modify to your own desires :)

<?php

$vendor_shop = urldecode( get_query_var( 'vendor_shop' ) );
$vendor_id   = WCV_Vendors::get_vendor_id( $vendor_shop );
  if ( $vendor_id ) {
?>

<center>
<?php
$vendor_name_message = get_userdata($vendor_id);
$current_user = wp_get_current_user();

if ( is_user_logged_in() ) {
  echo do_shortcode( '[button link="/members/'.$current_user->user_login.'/messages/compose/?r='.$vendor_name_message->user_login.'"]SEND ME A PRIVATE MESSAGE[/button]' );
  } else {
  echo do_shortcode( '[button link="/my-account/"]LOGIN TO SEND ME A PRIVATE MESSAGE[/button]' );
  };
  echo do_shortcode( '[button link="/members/'.$vendor_name_message->user_login.'"]VIEW MY PROFILE[/button]' );
?>
</center>

<?php

}

?>