API Pagination using has_more & next_cursor responses in an Post call

Hi,

API Newbie here. I have been able to make a 'post' call to the notion api in power query. Now I am trying to call to the next page with the provided next_cursor reponses as part of the body parameter 'start_cursor'. 

Here is my M function (my attempt at a 2nd call is commented out):

Let
AuthKey = "myAuthKey",
url="https://api.notion.com/v1/databases/myDBID/query",
body="{""Sorts"":""created_time""}",

Source = Json.Document(Web.Contents(url,[
Headers = [#"Authorization"=AuthKey ,
#"Content-Type"="application/json"],
Content = Text.ToBinary(body)
]
)),

//hasMore = Source[has_more],
//nextCursor = Source[next_cursor],
// body2 = "{""start-cursor"":"& nextCursor &",}",
// Source2 = Json.Document(Web.Contents(url,[
// Headers = [#"Authorization"=AuthKey ,
// #"Content-Type"="application/json"],
// Content = Text.ToBinary(body2)
// ]
// )),

results = Source[results]

in 

results

And here is the notion API docs: Pagination (notion.com)

Could someone please point me in the right direction? Should I be using a function?

Thanks

Hannah