Header query when sending mail

I have to do a task and I do not understand the requirement. I must send an email and send an email with information that is filled from a form. They asked me for the "headers" or "headers" to be like this from my fields in the form:

Nivel: (texto)(no obligatorio) ---> ##wcticket:Nivel##valor##
Tipo: (texto)(no obligatorio) --->  ##wc-ticket:Tipo##valor##
Actividad: (texto)(no obligatorio) ---> ##wc-ticket:Actividad##valor##
Nombre: (texto)(obligatorio) y Apellido: (texto)(obligatorio)---> wc-name:
e-Mail: (texto)(obligatorio) ---> wc-email:
teléfono: (texto)(obligatorio)  ---> wc-phone:

I use php and the php-mailer library but I do not understand how to send that as headers. Any ideas?

Thank you very much.