title: Number tracking implementation
body: <p>I'm about to implement my own tracking pixel in order to get visitor information from my marketing sites.</p>
  
  <p>In addition to the above I need to pass some information back (phone number) to the visitor and change the content of a specific span class tag on the site.</p>
  
  <p>I understand the process of passing information in the direction of my analytics server but not the other way around .</p>
  
  <p>I'm hoping to run this with php on the sever sites and JavaScript on the client side</p>
  
  <p>I know it's possible as a supplier of ours simply gives us a tracking code which is only a few lines long and we supply our class tag.</p>