import { RuStoreClient } from '@piavart/rustore-client';

const privateKey = 'MIIEvgIBADANBgkqhkiG9w0BAQEFAASZ...'
const companyId = 123;
const isSandbox = false;

const client = new RuStoreClient(privateKey, companyId, isSandbox);

const purchase = await client.getPurchase('123.321');