code: public Map<String, Object> deleteCreditCard(String creditCardId, Setup setup) {
          this.requestMaker = new RequestMaker(setup);
          RequestProperties props = new RequestPropertiesBuilder()
                  .method("DELETE")
                  .endpoint(String.format("/v2/fundinginstruments/%s", creditCardId))
                  .type(Customers.class)
                  .contentType(CONTENT_TYPE)
                  .build();
  
          return this.requestMaker.doRequest(props);
      }
docs: This method is used to delete a saved credit card of an customer.
  
  @param   creditCardId
  {@code String} the Moip credit card external ID.
  
  @param   setup
  {@code Setup} the setup object.
  
  @return  {@code Map<String, Object>}