code: public Map<String, Object> pay(Map<String, Object> body, String multiorderId, Setup setup) {
          this.requestMaker = new RequestMaker(setup);
          RequestProperties props = new RequestPropertiesBuilder()
                  .method("POST")
                  .endpoint(String.format("%s/%s/multipayments", ENDPOINT, multiorderId))
                  .body(body)
                  .type(Multipayments.class)
                  .contentType(CONTENT_TYPE)
                  .build();
  
          return this.requestMaker.doRequest(props);
      }
docs: This method is used to create a multipayment, it means create a payment for each order from a multiorder
  with the same funding instrument (credit card, boleto, online bank debit).
  
  @param   body
  {@code Map<String, Object>} the request body.
  
  @param   multiorderId
  {@code String} the Moip multiorder external ID.
  
  @param   setup
  {@code Setup} the setup object.
  
  @return  {@code Map<String, Object>}