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The dealer probably won't charge you any more to program both keys as they would the one key. I do hope both keys are really new. If they have been programmed before, or are not the correct part number key (there are SEVERAL) for your vehicle, the FOBIK you bought will not work and you have throwed that money away. But yes, far as I know dealer is your only option and they can cut the door key inside the FOBIK.
2007 Grand Caravan/3.8L V6/103K mi/original 41TE
2006 300C/5.7L HEMI V8/128/K mi/original W5A580
2002 PT Cruiser/2.4L I4/139K mi/original 40TE
1992 S-10/4.3L V6/249K mi/original 4L60E
1997 Grand Voyager SE/traded@192K mi/3.3L V6/original 41TE
2003 Grand Caravan Sport/3.8L V6/traded@124K mi/original 41TE
2007 T&C/3.8L V6/traded@44K mi/ original 41TE
2010 T&C Touring/3.8L V6/the ex's@72K mi/original 62TE