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async function* allContacts() {
  let after = null
  do {
    const url = new URL("https://app.eltick.com/api/v1/contacts")
    url.searchParams.set("limit", "200")
    if (after) url.searchParams.set("after", after)
    const res = await fetch(url, {
      headers: { Authorization: `Bearer ${process.env.ELTICK_API_KEY}` },
    })
    if (!res.ok) throw new Error((await res.json()).error)
    const page = await res.json()
    yield* page.data
    after = page.next
  } while (after)
}

for await (const contact of allContacts()) {
  console.log(contact.phone, contact.name)
}

import os, requests

def all_contacts():
    after = None
    while True:
        params = {"limit": 200}
        if after:
            params["after"] = after
        res = requests.get(
            "https://app.eltick.com/api/v1/contacts",
            headers={"Authorization": f"Bearer {os.environ['ELTICK_API_KEY']}"},
            params=params,
        )
        res.raise_for_status()
        page = res.json()
        yield from page["data"]
        after = page["next"]
        if not after:
            break

for contact in all_contacts():
    print(contact["phone"], contact["name"])

<?php
function all_contacts(): Generator {
  $after = null;
  do {
    $query = http_build_query(array_filter(["limit" => 200, "after" => $after]));
    $ch = curl_init("https://app.eltick.com/api/v1/contacts?$query");
    curl_setopt_array($ch, [
      CURLOPT_HTTPHEADER => ["Authorization: Bearer " . getenv("ELTICK_API_KEY")],
      CURLOPT_RETURNTRANSFER => true,
    ]);
    $page = json_decode(curl_exec($ch), true);
    yield from $page["data"];
    $after = $page["next"];
  } while ($after);
}

foreach (all_contacts() as $contact) {
  echo $contact["phone"] . " " . $contact["name"] . "\n";
}