import Stigg from '@stigg/typescript';

const client = new Stigg({
  apiKey: process.env['STIGG_API_KEY'], // This is the default and can be omitted
});

const response = await client.v1.subscriptions.invoice.markAsPaid('x');

console.log(response.data);

{
  "data": {
    "id": "<string>"
  }
}