Record refund for invoice

//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;

}

/**

 * Record refund for invoice

 * Records a refund for the invoice. If all payments are refunded, the invoice is marked as `REFUNDED`. Otherwise, the invoice is marked as `PARTIALLY REFUNDED`.

 */

export async function main(

  auth: Paypal,

  invoice_id: string,

  body: {

    type?: "PAYPAL" | "EXTERNAL";

    refund_id?: string;

    refund_date?: string;

    amount?: { currency_code: string; value: string };

    method:

      | "PAYPAL"

      | "BANK_TRANSFER"

      | "CASH"

      | "CHECK"

      | "CREDIT_CARD"

      | "DEBIT_CARD"

      | "WIRE_TRANSFER"

      | "OTHER";

  },

) {

  const token = await getToken(auth);

  const url = new URL(

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

  );

  const response = await fetch(url, {

    method: "POST",

    headers: {

      "Content-Type": "application/json",

      Authorization: "Bearer " + token,

    },

    body: JSON.stringify(body),

  });

  if (!response.ok) {

    const text = await response.text();

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

  }

  return await response.json();

}