REST API Paging Power Query

Based on the information you provided here is one possible implementation.  It is not optimized (page 1 is fetched twice) but it works.

You need two parameters - APIKey  and Limit .  The Limit parameter allows you to control how many items you want to retrieve in each web call.

let
    Source = Json.Document(Web.Contents("https://api.weasy.io/v1/catalog?X-API-KEY=" & APIKey & "&limit=" & Limit)),
    pages = {1..Source[paging][totalpages]},
    #"Converted to Table" = Table.FromList(pages, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
    #"Changed Type" = Table.TransformColumnTypes(#"Converted to Table",{{"Column1", type text}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Data", each Json.Document(Web.Contents("https://api.weasy.io/v1/catalog?X-API-KEY=" & APIKey & "&limit=" & Limit & "&page=" & [Column1]))),
    #"Expanded Data" = Table.ExpandRecordColumn(#"Added Custom", "Data", {"items"}, {"items"}),
    #"Expanded items" = Table.ExpandListColumn(#"Expanded Data", "items")
in
    #"Expanded items"