Twitter API v2 - Making a loop that collect an ID from a response, and insert on the next request - api

Question

I'm having trouble looping a group of requests on the "Full Archive Search" on Twitter API v2.
I need to get all the responses from a determined subject, but there is a limit of tweets per page. To cover this, a "next_token" is generated on the body response. I need to make lots of requests using the "next_token" as a parameter to the subsequent request.
The thing is, I have no idea how can i make a loop, and collect all the responses.
There are more than 500.000 tweets in the period that I am searching for. And the limit of tweets per page is 500.
I'm using the default request from the "Full Archive Search", on Twitter API, using "query", "start_time" and "end_time"
The response that I got has a limit of tweets per page. At the bottom of each page, have the following lines:
"meta": {
"newest_id": "1321965025809059840",
"oldest_id": "1321964960956768256",
"result_count": 8,
**"next_token": "b26v89c19zqg8o3fosbski4ttnan7ven9iyr8gbrdfiwt"**}
I need to get that "next_token" and add it to the subsequent request.
Does anyone have an idea how can i collect all this data?
Edit: I tried to use the code below to get the "next_token":
pm.test("Set Next Token", function () {
var jsonData = pm.response.json();
console.log(jsonData.next_token)
pm.collectionVariables.set("next_token", jsonData.next_token);
});
But it returns to this error:
{
"errors": [
{
"parameters": {
"next_token": [
"null"
]
},
"message": "Invalid 'next_token':'null'."
}
],
"title": "Invalid Request",
"detail": "One or more parameters to your request was invalid.",
"type": "https://api.twitter.com/2/problems/invalid-request"
}