API Loop not working in M Query

[LarryBroward]

Hi,

In the code below I can see the day increment is working the first time thru but it doesn't increment and call the api a second time.

Is there anything obvious that I am doing wrong.

Thanks 

(ApiParamStartDate as date,ApiParamEndDate as date,optional loop as number,optional data as list) =>

let

newstart = Date.AddDays(ApiParamStartDate,1),

sd = Date.ToText(newstart) & "%2000%3A00",
ed = Date.ToText(newstart) & "%2023%3A59",

Source =

// call a 61 second delay function here
//Function.InvokeAfter(

Json.Document(Web.Contents(
"https://cloud.com/api/v4/get_readings/?device_sn=12345&start_date=" &Text.From(sd)&"&end_date="&Text.From(ed)&"&output_format=json&page_num=1&per_page=2000",
[Headers=[Accept="application/json", Authorization="Token xxxxx"]])),

//#duration(0,0,1,1))),

//loop
loopNum = loop + 1,

currentData = Record.ToList(Source[data]) ,

appendedData =

if currentData is null and data is null then {}
else if data is null then List.Combine({{}, currentData})
else if data is null then List.Combine ({data,{}})
else List.Combine(data,currentData) ,

output =

if ApiParamStartDate <= ApiParamEndDate or loopNum < 10
then
appendedData

else
@#"GET Activity" (ApiParamStartDate,ApiParamEndDate,loopNum, appendedData)

in output