Post transfers id reversals

type Stripe = {

  token: string;

};

/**

 * Post transfers id reversals

 * When you create a new reversal, you must specify a transfer to create it on.

When reversing transfers, you can optionally reverse part of the transfer. You can do so as many times as you wish until the entire transfer has been reversed.

Once entirely reversed, a transfer can’t be reversed again. This method will return an error when called on an already-reversed transfer, or when trying to reverse more money than is left on a transfer.

 */

export async function main(

  auth: Stripe,

  id: string,

  body: {

    amount?: number;

    description?: string;

    expand?: string[];

    metadata?: { [k: string]: string } | "";

    refund_application_fee?: boolean;

  }

) {

  const url = new URL(`https://api.stripe.com/v1/transfers/${id}/reversals`);

  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("&"));

}