Adding profiles with Klaviyo API

klaviyo.ts

const BASE_URL = "https://a.klaviyo.com/api";
const baseHeaders = new Headers({
  accept: "application/json",
  revision: "2023-01-24",
  Authorization: `Klaviyo-API-Key ${process.env.KLAVIYO_API_KEY}`,
});
const getHeaders = new Headers(baseHeaders);
const postHeaders = new Headers(baseHeaders);
postHeaders.append("Content-Type", "application/json");

export const subscribeUserWithEmail = async (
  user: Omit<User, "plan" | "name"> & { description: string }
) => {
  const profiles = await fetch(
    `${BASE_URL}/profiles?filter=equals(email,"${user.email}")`,
    {
      method: "GET",
      headers: getHeaders,
    }
  ).then((response) => response.json());

  if (profiles.data.length === 0) {
    const profile = await fetch(`${BASE_URL}/profiles`, {
      method: "POST",
      headers: postHeaders,
      body: JSON.stringify({
        data: {
          type: "profile",
          attributes: {
            email: user.email,
            external_id: user.id,
            first_name: user.first_name,
            last_name: user.last_name,
            properties: {
              "Which best describes you?": user.description,
            },
          },
        },
      }),
    }).then((response) => response.json());

    console.log(profile);
  }
};