code: public InstagramService build() {
  		InstagramApi api = new InstagramApi();
  		OAuthConfig config;
  
  		Preconditions.checkEmptyString(apiKey, "You must provide an api key");
  		Preconditions.checkEmptyString(apiSecret, "You must provide an api secret");
  
  		config = new OAuthConfig(apiKey, apiSecret, callback, scope, display);
  
  		if (this.requestProxy != null) {
  			config.setRequestProxy(this.requestProxy);
  		}
  
  		return api.createService(config);
  	}
docs: Returns the fully configured {@link OAuthService}
  
  @return fully configured {@link OAuthService}