Call API 1 day at a time and create/append the data until end date is satisfied. Add 60 sec delay

The requirement is to call an API and append to the output api 1 day at a time and add a 60 second delay in between. This would be refeshed daily. It would be the last N number of days, two weeks max .So I will pass a start and end date. The basic functionality is working, I can get one day of data returned. The problem is incrementng and getting the next days data. Also the delay function (Just Getting a date with a duration) isnt working so i am not sure if that is allowed or if I am notdoing right. I do know the URL isn't firing a second time because the API would fail without the delay. I think I am on the right track. Let me know if you have any suggestions or if I am way off base.

Thanks

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

let

sd = Date.ToText(ApiParamStartDate) & "%2000%3A00", //12 AM One day at a time , loop back and get the next day after incrementing.
ed = Date.ToText(ApiParamStartDate) & "%2023%3A59", // 11:59 PM

Source = Json.Document(Web.Contents(
"https://XXXXXXXXXXX.com/api/v4/get_readings/?device_sn=xxxxx&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 xxxxxxxxxxxxxxxxxxxxx"]])),

currentData = Source, // 1st api data returned

appendedData = Source,
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}),

//loop
loopNum = loop + 1,
output =
if ApiParamStartDate <= ApiParamEndDate or loopNum < 10 // Get 10 daysof day 1 api call returns 1 day
// delay() call a 60 second delay function here
@#"GET Activity" (Date.AddDays(ApiParamStartDate,1),"",loopNum, appendedData) // add 1 day to start date paramater, End date will be the same
else
//
in output