Email copy of Vendor Approval to admin email - WC Vendors & Pro

functions.php

add_filter( 'woocommerce_email_headers', 'custom_vendor_application', 10, 2);
 
function custom_vendor_application( $headers, $email ) {
    if ($email == 'vendor_application') {
        $headers .= 'BCC: Your Name <youremail@yourwebsite.com>' . "\r\n";
    }
 
    return $headers;
}