Credentials ??? Training and experience (how many successful procedures) is what you're after. If you are considering rhinoplasty, I would strongly encourage you to travel State-side. It is the most complicated of Plastic surgery's and requires an accomplished surgeon for a successful outcome. If it is not trauma related put that one off.
For Liposuction / Lipoplasty go ahead.
On second thought ,why not travel Stateside for any elective cosmetic surgery. Anesthesia post operative delirium is a life changer and is best dealt with in the States.
...because plastic surgery in the US is absurdly expensive whilst in the DR it is affordable you should always, always, always get damn good references for the surgeon. I'm old enough that plastic surgery can't fix what gravity has done but if I were younger I'd probably do it here yet with very, very well vetted surgeons. Just check, check and then double check.
i have two plastic surgeons in the family now. one has worked on many ladies i know, i have seen her work. the other one graduated fairly recently and just came back from mexico, where he did his specialty. i shall wait to see his work. when time comes for me to fix something i will make my decision.
you have to see the work, if not in person then on pictures. read about your surgeons on the internet, plenty of forums where people discuss the subject of plastic surgery. a consult with two or three different doctors. then you can make up your mind...