Any notice required to be given pursuant to this Agreement shall be in writing and mailed by certified or registered mail, return receipt requested, or delivered by a national overnight express service, as follows: If to Customer, to the address provided by Customer under Customer’s signature below. If to NEXOGY , Attn: CFO, 2121 Ponce de Leon Blvd. Suite 200, Coral Gables, Florida 33134. A party may change the designated address to receive notice by written notice to the other party.