Paging: where does the page value increase

I see in the code where page is set to 0

static async getMovies({
// here’s where the default parameters are set for the getMovies method
filters = null,
page = 0,
moviesPerPage = 20,

One of the things that was throwing me off was…where is page increasing? I mean where in the code is page moving (or increasing in number) from page 1 to page 2, etc…something like a page++
Am I overlooking this part?