Powerquery looping over paginated API - dynamic data source error

Found a solution by putitng the start time parameter in the 'query' part of the webcontents function.

sorry I just saw your message. Are you working with the zendesk API? i did manage to make it work in the end. you can play around with the data count number/unix start time.

let
    
    BaseUrl = "https://xxx.zendesk.com",
    Token = "xxx",
    StartingOptions = [RelativePath="/api/v2/incremental/tickets.json?include=comment_count",Headers=[ #"Authorization" = "Basic " & Token ],Query=[start_time="1633089331"]],
     initReq = Json.Document(Web.Contents("https://xxx.zendesk.com", StartingOptions)),
    initData = initReq[tickets],
    gather = (tickets as list, QParm) =>
        let
         BaseUrl = "https://xxx.zendesk.com",
         Token = "xxx",
         StartingOptions = [RelativePath="/api/v2/incremental/tickets.json?include=comment_count",Headers=[ #"Authorization" = "Basic " & Token ],Query=[start_time=QParm]],
         newOffset = Text.From(Json.Document(Web.Contents("https://xxx.zendesk.com",StartingOptions))[end_time]),
         newOptions = [RelativePath="/api/v2/incremental/tickets.json?include=comment_count",Headers=[ #"Authorization" = "Basic " & Token ],Query=[start_time=newOffset]],
         newReq = Json.Document(Web.Contents("https://xxx.zendesk.com",newOptions)),
         newdata = newReq[tickets],
         data = List.Combine({tickets, newdata}),
         datacount = List.Count(data),
         check = if Text.From(newReq[end_of_stream]) = "true" or datacount >=300000 then data else @gather(data, newOffset)
        in check,
   outputList =  if Text.From(initReq[end_of_stream]) = "true" then initData else gather(initData,"1633089331"),
    expand = Table.FromRecords(outputList),
    #"Filtered Rows" = Table.SelectRows(expand, each ([status] <> "deleted"))
   
in
#"Filtered Rows"