Converting Base64 value to use in pagination

Still trying to figure this out, the below code only returns page one. The "url" parameter is the full url for page one and "Token" is the key

et
    // Base URL
    baseUrl = "https://apis-us.MYAPI.com",
    initialUrl = baseUrl & "/v1/dep/13473/projects?page[size]=100&page[number]=MQ==",
    
    // Function to get data from a given URL with authorization header
    GetPage = (url as text) as record =>
        let
            response = Json.Document(Web.Contents(url,
            [Headers=[Authorization=Token, #"Content-Type"="application/vnd.api+json"]]
)),
            data = if Record.HasFields(response,"data") then response[data] else {},
            links = if Record.HasFields(response, "links") then response[links] else null, 
            nextLink = if links <> null and Record.HasFields(links, "next") then links[next] else null,
            nextUrl = if nextLink <> null and Text.StartsWith(nextLink, "http") then nextLink else baseUrl & nextLink
        in
            [Data = data, NextLink = nextUrl],
    
    // Function to loop through pages and combine data
    GetAllPages = (url as text) as table =>
        let
            firstPage = GetPage(url),
            allData = List.Generate(
                () => firstPage,
                each _[NextLink] <> null,
                each GetPage(_[NextLink]),
                each _[Data]
            )
        in
            Table.Combine(List.Transform(allData, each Table.FromList(_, Splitter.SplitByNothing()))),
    
    // Initial call to get all pages
    result = GetAllPages(initialUrl)
in
    result