You can program additional keys into a Ford Mondeo from 1995 to 2007 using a manual procedure. To do this you must be in possession of a red master key (1995-1999) or two unique keys (2000-2007) that start the vehicle. The transponder chip in one key can't be a copy or clone of the other.
The key programming procedures are available here:
Ford Mondeo 1995-1999 key programming
Ford Mondeo 2000-2007 key programming
If you do not have a red master key or two unique keys then a diagnostic machine plugged into the vehicle will be required.
Alternatively... if a key that starts the vehicle is brought or sent to us we have the facilities to copy the transponder chip within it onto a new one. The new key will then start the vehicle without any further programming being required. Email us at firstname.lastname@example.org for further information.