@bclayshannon said:
Can I get just the mpaa rating, passing the imdb id (such as "tt41025" or whatever)?
... My big question is, are mpaa ratings part of the data returned? One scenario is that I will already have all the other data, but am only missing that piece of information.
If such is the case, can I make a REST call (C#), passing an ID value (or movie title) and get back the mpaa rating (G, PG, PG-13)?

With IMDB ID no. With TMDb ID yes.
Certification or Rating MPAA is linked to release_dates.
So, if what you want is just that data, you need to make an API Request of type get / movie / {movie_id} / release_dates .
See here: https://developers.themoviedb.org/3/movies/get-movie-release-dates
Example: https://api.themoviedb.org/3/movie/550/release_dates?api_key=THE_KEY
You will receive Certication from all countries.
Of course, as long as they have been added to TMDb.

Thanks!

I see with the second example (which returns a "boatload" of data), that the piece I am interested in is this:

{"iso_3166_1":"US","release_dates":[{"certification":"R","iso_639_1":"","note":"","release_date":"1999-10-15T00:00:00.000Z","type":3}]}

Specifically I want the ""US" ... certification":"R"" part of it. Is there a way to just get that back - the US-only info?

I have a second question, but I'll make it a separate one.

What if I don't know the release date of a movie? Is there any way to retrieve its "certification" value (MPAA rating)?

@bclayshannon said:
Thanks!
Specifically I want the ""US" ... certification":"R"" part of it.
Is there a way to just get that back - the US-only info?

and

What if I don't know the release date of a movie?
< Is there any way to retrieve its "certification" value (MPAA rating)?

I do not think so. I do not know.
Only if requested using release_dates.
The API Request can be done in the specific way I showed you before:
https://api.themoviedb.org/3/movie/550/release_dates?api_key=THE_KEY
As can also be done using the append_to_response feature in a Basic Request.
See here https://developers.themoviedb.org/3/movies/get-movie-details
And here https://developers.themoviedb.org/3/getting-started/append-to-response
Example https://api.themoviedb.org/3/movie/550?api_key=THE_KEY&language=en-US&append_to_response=release_dates

Every Certification is linked to a release_date.
Sometimes, the film is released in theaters, with stronger cut scenes,
to be able to have a lighter certification. For example: G or PG.
Then, the film is successful, they decide to launch a Bluray with the director's version,
longer and with those scenes that were cut, and will receive a heavier Certification. For example: PG-13

Since I don't care about the release date, and I just want the U.S. MPAA Rating based on an imdb MovieId (tconst), am I right that the following will do the trick for me (it seems to):

[ "Blade Runner" example (tt0083658) ] https://api.themoviedb.org/3/movie/tt0083658/release_dates?api_key=MY_API_KEY

?

In other words, I don't think I need to get the release date first, as the release date is not passed as an arg to the REST call above

@bclayshannon said:
Since I don't care about the release date, and I just want the U.S. MPAA Rating based on an imdb MovieId (tconst), am I right that the following will do the trick for me (it seems to):
[ "Blade Runner" example (tt0083658) ]
https://api.themoviedb.org/3/movie/tt0083658/release_dates?api_key=MY_API_KEY
?
In other words, I don't think I need to get the release date first, as the release date is not passed as an arg to the REST call above

Yes, if you just need the certification, just this Request, just like the one I put in my first comment.

So, if what you want is just that data, you need to make an API Request of type get / movie / {movie_id} / release_dates .
See here: https://developers.themoviedb.org/3/movies/get-movie-release-dates
Example: https://api.themoviedb.org/3/movie/550/release_dates?api_key=THE_KEY
You will receive Certication from all countries.

Using the IMDB ID still works on that API Request.
But at any moment it can stop working.
The guarantee is to use the TMDb ID.

Thanks, but this part is scary: "The guarantee is to use the TMDb ID."

I'll create a new question on how to get the TMDB Id using the imdb Id.