Generate invoice number

//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;

}

/**

 * Generate invoice number

 * Generates the next invoice number that is available to the merchant. The next invoice number uses the prefix and suffix from the last invoice number and increments the number by one. For example, the next invoice number after `INVOICE-1234` is `INVOICE-1235`.

 */

export async function main(auth: Paypal) {

  const token = await getToken(auth);

  const url = new URL(

    `https://api-m.paypal.com/v2/invoicing/generate-next-invoice-number`,

  );

  const response = await fetch(url, {

    method: "POST",

    headers: {

      Authorization: "Bearer " + token,

    },

    body: undefined,

  });

  if (!response.ok) {

    const text = await response.text();

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

  }

  return await response.json();

}