code: public void setApiKeyIdPropertyName(String apiKeyIdPropertyName) {
          this.clientBuilder.setApiKey(ApiKeys.builder().setIdPropertyName(apiKeyIdPropertyName).build());
      }
docs: Calls {@code clientBuilder.setApiKey(ApiKeys.builder().}{@link com.stormpath.sdk.api.ApiKeyBuilder#setIdPropertyName(String) setIdPropertyName(apiKeyIdPropertyName)}{@code .build())}.
  
  @param apiKeyIdPropertyName the name used to query for the API Key ID from a Properties instance.
  @see ClientBuilder#setApiKey(com.stormpath.sdk.api.ApiKey)
  @see com.stormpath.sdk.api.ApiKeyBuilder#setIdPropertyName(String)
  @since 0.2