Post tax calculations

type Stripe = {

  token: string;

};

/**

 * Post tax calculations

 * Calculates tax based on input and returns a Tax Calculation object.

 */

export async function main(

  auth: Stripe,

  body: {

    currency: string;

    customer?: string;

    customer_details?: {

      address?: {

        city?: string | "";

        country: string;

        line1?: string | "";

        line2?: string | "";

        postal_code?: string | "";

        state?: string | "";

        [k: string]: unknown;

      };

      address_source?: "billing" | "shipping";

      ip_address?: string;

      tax_ids?: {

        type:

          | "ad_nrt"

          | "ae_trn"

          | "ar_cuit"

          | "au_abn"

          | "au_arn"

          | "bg_uic"

          | "bo_tin"

          | "br_cnpj"

          | "br_cpf"

          | "ca_bn"

          | "ca_gst_hst"

          | "ca_pst_bc"

          | "ca_pst_mb"

          | "ca_pst_sk"

          | "ca_qst"

          | "ch_vat"

          | "cl_tin"

          | "cn_tin"

          | "co_nit"

          | "cr_tin"

          | "do_rcn"

          | "ec_ruc"

          | "eg_tin"

          | "es_cif"

          | "eu_oss_vat"

          | "eu_vat"

          | "gb_vat"

          | "ge_vat"

          | "hk_br"

          | "hu_tin"

          | "id_npwp"

          | "il_vat"

          | "in_gst"

          | "is_vat"

          | "jp_cn"

          | "jp_rn"

          | "jp_trn"

          | "ke_pin"

          | "kr_brn"

          | "li_uid"

          | "mx_rfc"

          | "my_frp"

          | "my_itn"

          | "my_sst"

          | "no_vat"

          | "no_voec"

          | "nz_gst"

          | "pe_ruc"

          | "ph_tin"

          | "ro_tin"

          | "rs_pib"

          | "ru_inn"

          | "ru_kpp"

          | "sa_vat"

          | "sg_gst"

          | "sg_uen"

          | "si_tin"

          | "sv_nit"

          | "th_vat"

          | "tr_tin"

          | "tw_vat"

          | "ua_vat"

          | "us_ein"

          | "uy_ruc"

          | "ve_rif"

          | "vn_tin"

          | "za_vat";

        value: string;

        [k: string]: unknown;

      }[];

      taxability_override?: "customer_exempt" | "none" | "reverse_charge";

      [k: string]: unknown;

    };

    expand?: string[];

    line_items: {

      amount: number;

      product?: string;

      quantity?: number;

      reference?: string;

      tax_behavior?: "exclusive" | "inclusive";

      tax_code?: string;

      [k: string]: unknown;

    }[];

    shipping_cost?: {

      amount?: number;

      shipping_rate?: string;

      tax_behavior?: "exclusive" | "inclusive";

      tax_code?: string;

      [k: string]: unknown;

    };

    tax_date?: number;

  }

) {

  const url = new URL(`https://api.stripe.com/v1/tax/calculations`);

  const response = await fetch(url, {

    method: "POST",

    headers: {

      "Content-Type": "application/x-www-form-urlencoded",

      Authorization: "Bearer " + auth.token,

    },

    body: encodeParams(body),

  });

  if (!response.ok) {

    const text = await response.text();

    throw new Error(`${response.status} ${text}`);

  }

  return await response.json();

}

function encodeParams(o: any) {

  function iter(o: any, path: string) {

    if (Array.isArray(o)) {

      o.forEach(function (a) {

        iter(a, path + "[]");

      });

      return;

    }

    if (o !== null && typeof o === "object") {

      Object.keys(o).forEach(function (k) {

        iter(o[k], path + "[" + k + "]");

      });

      return;

    }

    data.push(path + "=" + o);

  }

  const data: string[] = [];

  Object.keys(o).forEach(function (k) {

    if (o[k] !== undefined) {

      iter(o[k], k);

    }

  });

  return new URLSearchParams(data.join("&"));

}