Hi jbrown184 

That is expected as you are using a url string from concatenating  using different text strings. Use relative property of web.contents. Examples:

let
    BaseUrl = "https://www.baseurl.com",
    PageSize = 500,
    Page = [page column],
    RelativePath = Text.Combine({"/orders?pageSize=", Text.From(PageSize), "&page=", Text.From(Page)}),
    AuthorizationKey = "Basic " & "actual key",  --key could be parameterized
    Response = Web.Contents(BaseUrl, 
        [
            RelativePath = RelativePath, 
            Headers = [Authorization = AuthorizationKey]
        ]
    ),
    Data = Json.Document(Response)
in
    Data

let
    PageSize = 500,
    Page = [page column], 
    BaseUrl = "https://www.baseurl.com",
    AuthorizationKey = "Basic yourkey=", // --or use a parameter
    Response = Web.Contents(
        BaseUrl,
        [
            RelativePath = "orders",
            Query = [pageSize = Text.From(PageSize), page = Text.From(Page)],
            Headers = [Authorization = AuthorizationKey]
        ]
    ),
    Data = Json.Document(Response)
in
    Data

Text.From on PageSize and Page is not needed if both are texts.

HI! I did what you said. I made a paramater. When I go back to powerbi.com it still says "

This dataset includes a dynamic data source". Here is what I did....

screenshots are too small read.  Please repost.

Please follow the documentation. Use RelativePath and Query parameters. https://learn.microsoft.com/en-us/powerquery-m/web-contents#example-1