movie website , how to get casts of a movie in my DB, from external Api tmdb

hi, iam working a project that i want to build a movie website, i have a movie model, which stores movie name, movie url , movie etc.

but when iam showing that specific movie in to the end user , i want to also show the casts of this movie from external Api tmdb, when the user clicks a specific cast thumnail, i want to render actors page for details for that actor from external api tmdb.

so how can i incorporate this casts which are not stored in my db but from external api, tmdb to this movie.

i searched i heard something about imdb_id.

i saw a lot of websites built like that.

when you inspect the url of the image it gives like this https://image.tmdb.org/t/p/w276_and_h350_face/kflgvFCFZnpTRbKmJWn5T0G5EKI.jpg

the website that i think is using something like this concept is www.fanproj.com