Delete external refund

//native

type Paypal = {

  clientId: string;

  clientSecret: string;

};

async function getToken(auth: Paypal): Promise<string> {

  const url = new URL(`https://api-m.paypal.com/v1/oauth2/token`);

  const response = await fetch(url, {

    method: "POST",

    headers: {

      Authorization: `Basic ${btoa(`${auth.clientId}:${auth.clientSecret}`)}`,

    },

    body: new URLSearchParams({

      grant_type: "client_credentials",

    }),

  });

  if (!response.ok) {

    const text = await response.text();

    throw new Error(`Could not get token: ${response.status} ${text}`);

  }

  const json = await response.json();

  return json.access_token;

}

/**

 * Delete external refund

 * Deletes an external refund, by invoice ID and transaction ID.

 */

export async function main(

  auth: Paypal,

  invoice_id: string,

  transaction_id: string,

) {

  const token = await getToken(auth);

  const url = new URL(

    `https://api-m.paypal.com/v2/invoicing/invoices/${invoice_id}/refunds/${transaction_id}`,

  );

  const response = await fetch(url, {

    method: "DELETE",

    headers: {

      Authorization: "Bearer " + token,

    },

    body: undefined,

  });

  if (!response.ok) {

    const text = await response.text();

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

  }

  return await response.json();

}