lib/mercadopago-support.js
function createPreference(preferences) {
    var callback = preConditions.getCallback(arguments[arguments.length - 1]);

    showWarning();

    return preferencesModule.create(preferences, callback);
  }
function createPreference(preferences) {
    var callback = preConditions.getCallback(arguments[arguments.length - 1]);

    showWarning();

    return preferencesModule.create(preferences, callback);
  }
function createPreference ( preferences ) { var callback = preConditions . getCallback ( arguments [ arguments . length - 1 ] ) ; showWarning ( ) ; return preferencesModule . create ( preferences , callback ) ; }
Create a preference using preferenceModule
@param preferences
@param callback
@returns {preferences}
Create a preference using preferenceModule