Transacción Completa - Consulta de cuotas

const TransaccionCompleta = require('transbank-sdk').TransaccionCompleta; // ES5
import { TransaccionCompleta } from 'transbank-sdk'; // ES6

const installmentsResponse = await (new TransaccionCompleta.Transaction()).installments(
  token, 
  installments, 
);

{
 "installments_amount": 599,
 "id_query_installments": 58499240,
 "deferred_periods": []
}