how to create a query that paginates?

EDIT:  I posted this to the wrong thread(!).  I should have replied here, and I'll continue and close the thread there.

Thanks ImkeF

My apologies for taking so long to acknowledge your support.  I've finally got around to having a go at List.Generate() and I reckon that I'm on the right path.  However, I think that I've created an infinite loop and thus launch a small-scale DoS attack against the Web API I'm trying to hit :-) 

Would you mind taking a look at my query text and giving me your opinion?  When I run it, I receive no errors, but the query appears to run forever.  At this point all that I'm trying to do is generate a list of URIs where I supply the first, and generate the rest based on the initial return.

let
    URIList = List.Generate(
    ()=> [SourceURI="https://api.dovico.com/TimeEntries/?version=5"],
    each Text.PositionOf([SourceURI],"N/A") = -1,
    each [
        Source = Web.Contents([SourceURI],[Headers=[#"Authorization"="WRAP access_token=""client=XXX&user_token=YYY"""]]),
        ImportedXML = Xml.Tables(Source,null,1252),
        ChangedType = Table.TransformColumnTypes(ImportedXML,{{"PrevPageURI", type text