Note that it is not the FOB that 'gets programmed'... The FOB's come with unique serial numbers embedded in them and it is the vehicle that 'gets programmed' to accept a given FOB. Of course that is the electronic portion. There is also the mechanical part of the key that does get 'cut' like an old fashioned key. I wouldn't be surprised if a place like Ace could cut the mechanical part, but electronically programming the vehicle would be surprising if they could do that (the most important part).
There are a couple of gotcha's to look out for here - First: Ace is likely to not have a FOB that is compatible with the Clarity (and if they did, it would probably be a lot more expensive than the ~$30 that you can find one on eBay for). They specifically state that you must purchase the key from them, so you likely couldn't walk in with your own eBay key and expect them to 'program' it. Second: There is 'programming' and there is 'programming'. There may be some FOB's that do get programmed, and maybe Ace can do those. In the case of the Clarity, it is the vehicle that 'gets programmed' and it is less likely that they could do that.