Pull data fromAPI with token from multiple query, each one invalidate each other's token

I have a dataflow with multiple queries ( i have 8 queries) that are getting data from a third party API.

Each query call the get_token() function at the beggining and stores it in a variable to use in the mulitple calls. But each API call to get the token, invalidates the previous token. Since the api call returns multiple pages, each query will call the api multiple time and thus the stored token within the query will be invalid because the other query will have generated a new token. (It's my understanding that those query are run simultaneously when ran manually or on schedule)

When the scheduled refresh of the dataflow happens (only showing 2 query instead of 8 to simplify)

1. query1 call get_token() and stores it 
2. query1make api request, API return results page one
3. query2 call get_token() and stores it 
4. query2make api request, API return results page one
5. query1 make api request for results page2, doesn't work because authentication failed

I have a function that gets the token

() =>
let
    url = "xxxxxxxxx",  //url to get the token
    headers = [#"accept" = "application/json",#"Content-Type" = "application/json"],
    postdata = Json.FromValue(
      [
          ident = "xxxx",
          username = "xxxx@xxxx",
          password = "xxxxxxx"
      ]
    ),
    response = Web.Contents(url, [Headers = headers, Content = postdata]), //adding a Web.Contents call switches the https request from GET to POST
    Data = Json.Document(response),
    token = Data[accessToken]
  in
    token

If I run query1 on schedule alone without query2, it works perfectly. 

If I run query2 on schedule alone without query1, it works perfectly. 

 Yes, it would be possible to call the api to get the token before calling next page, but that seems like a bad way and I would think that a race condition could occur and one query would invalidate another one.

I couldn't find anything regarding creating a global variable that every query can refer to instead of calling the function and generating a new token. Is there a way to have a function call the api only once, then on every other time that function is called, the token is return from a variable?

Thank you.